11. Waves

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Solution

The displacement of a travelling wave y = Csin (at −x ) where t is time, x is distance and λ is the wavelength, all in S.I. units. Then the frequency of the wave is

[NEET 2024 Re]

The displacement of a travelling wave y = Csin (at −x ) where t is time, x is distance and λ is the wavelength, all in S.I. units. Then the frequency of the wave is

[NEET 2024 Re]

Two slits in Young's double slit experiment are 1.5 mm apart and the screen is placed at a distance of 1m from the slits. If the wavelength of light used is 600 × 10⁻⁹m then the fringe separation is

[NEET 2024 Re]

Two slits in Young's double slit experiment are 1.5 mm apart and the screen is placed at a distance of 1m from the slits. If the wavelength of light used is 600 × 10⁻⁹m then the fringe separation is

[NEET 2024 Re]

Interference pattern can be observed due to superposition of the following waves:
A. y = asin ωt
B. y = asin 2ωt
C. y = asin (ωt − ϕ)
D. y = asin 3ωt
Choose the correct answer from the options given below.

[NEET 2024 Re]

Interference pattern can be observed due to superposition of the following waves:
A. y = asin ωt
B. y = asin 2ωt
C. y = asin (ωt − ϕ)
D. y = asin 3ωt
Choose the correct answer from the options given below.

[NEET 2024 Re]

The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is

[NEET 2023]

The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is

[NEET 2023]

The 4th overtone of a closed organ pipe is same as that of 3rd overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is :

[NEET 2023 mpr]

The 4th overtone of a closed organ pipe is same as that of 3rd overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is :

[NEET 2023 mpr]

If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is

If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is

An organ pipe filled with a gas at 27∘C resonates at 400‌Hz in its fundamental mode. If it is filled with the same gas at 90∘C, the resonance frequency at the same mode will be:

An organ pipe filled with a gas at 27∘C resonates at 400‌Hz in its fundamental mode. If it is filled with the same gas at 90∘C, the resonance frequency at the same mode will be:

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6Hz. When tension in B is slightly decreased, the beat frequency increases to 7Hz. If the frequency of A is 530Hz, the original frequency of B will be

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6Hz. When tension in B is slightly decreased, the beat frequency increases to 7Hz. If the frequency of A is 530Hz, the original frequency of B will be

A tuning fork with frequency 800Hz produces resonance in a resonance column tube with upper end open and lower end closed by water surface. Successive resonance are observed at length 9.75cm 31.25cm and 52.75cm. The speed of sound in air is

A tuning fork with frequency 800Hz produces resonance in a resonance column tube with upper end open and lower end closed by water surface. Successive resonance are observed at length 9.75cm 31.25cm and 52.75cm. The speed of sound in air is

Q.10 In-correct

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27∘C two successive resonances are produced at 20cm and 73cm of column length. If the frequency of the tuning fork is 320Hz, the velocity of sound in air at 27∘C is

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27∘C two successive resonances are produced at 20cm and 73cm of column length. If the frequency of the tuning fork is 320Hz, the velocity of sound in air at 27∘C is

Q.11 In-correct

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20cm, the length of the open organ pipe is

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20cm, the length of the open organ pipe is

Q.12 In-correct

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?

(2017 NEET)

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?

(2017 NEET)

Q.13 In-correct

Two cars moving in opposite directions approach each other with speed of 22ms−1 and 16.5ms−1 respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is
[velocity of sound is 340ms−1]

(2017 NEET)

Two cars moving in opposite directions approach each other with speed of 22ms−1 and 16.5ms−1 respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is
[velocity of sound is 340ms−1]

(2017 NEET)

Q.14 In-correct

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms−1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is
(Take velocity of sound in air=330ms−1)

(2016 NEET Phase-I)

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms−1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is
(Take velocity of sound in air=330ms−1)

(2016 NEET Phase-I)

Q.15 In-correct

An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is

(2016 NEET Phase-I)

An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is

(2016 NEET Phase-I)

Q.16 In-correct

A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength λ1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ2.The ratio

(2016 NEET Phase-I)

A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength λ1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ2.The ratio

(2016 NEET Phase-I)

Q.17 In-correct

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L metre long. The length of the open pipe will be

(2016 NEET Phase-II)

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L metre long. The length of the open pipe will be

(2016 NEET Phase-II)

Q.18 In-correct

Three sound waves of equal amplitudes have frequencies (n−1),n(n+1). They superimpose to give beats. The number of beats produced per second will be

(2016 NEET Phase-II)

Three sound waves of equal amplitudes have frequencies (n−1),n(n+1). They superimpose to give beats. The number of beats produced per second will be

(2016 NEET Phase-II)

Q.19 In-correct

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is

Q.20 In-correct

4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0JK−1mol−1.If the speed of sound in this gas at NTP is 952ms−1,then the heat capacity at constant pressure is
(Take gas constant R=8.3JK−1mol−1)

4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0JK−1mol−1.If the speed of sound in this gas at NTP is 952ms−1,then the heat capacity at constant pressure is
(Take gas constant R=8.3JK−1mol−1)

Q.21 In-correct

A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 m s'1 at an angle of 60° with the source observer line as shown in the figure. The observer is at rest.
The apparent frequency observed by the observer(velocity of sound in air 330ms−1), is

A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 m s'1 at an angle of 60° with the source observer line as shown in the figure. The observer is at rest.
The apparent frequency observed by the observer(velocity of sound in air 330ms−1), is

Q.22 In-correct

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

(2015, Cancelled)

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

(2015, Cancelled)

Q.23 In-correct

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are
(Velocity of sound =340ms−1)

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are
(Velocity of sound =340ms−1)

Q.24 In-correct

A speeding motorcyclist sees traffic jam ahead him. He slows down to 36kmhour−1 He finds that traffic has eased and a car moving ahead of him at 18kmhour−1 is honking at a frequency of 1392 Hz. If the speed of sound is 343ms−1, the frequency of the honk as heard by him will be

A speeding motorcyclist sees traffic jam ahead him. He slows down to 36kmhour−1 He finds that traffic has eased and a car moving ahead of him at 18kmhour−1 is honking at a frequency of 1392 Hz. If the speed of sound is 343ms−1, the frequency of the honk as heard by him will be

Q.25 In-correct

If we study the vibration of a pipe open at both ends, then the following statement is not true.

(2013 NEET)

If we study the vibration of a pipe open at both ends, then the following statement is not true.

(2013 NEET)

Q.26 In-correct

A wave travelling in the +ve x-direction having displacement along y-direction as 1 m, wavelength 2πm and frequency of

Hz is represented by

(2013 NEET)

A wave travelling in the +ve x-direction having displacement along y-direction as 1 m, wavelength 2πm and frequency of

Hz is represented by

(2013 NEET)

Q.27 In-correct

A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is

(2013 NEET)

A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is

(2013 NEET)

Q.28 In-correct

The length of the wire between two ends of a sonometer is 100cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio 1: 3: 5

The length of the wire between two ends of a sonometer is 100cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio 1: 3: 5

Q.29 In-correct

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1ms−1. If the speed of sound is 330m∕s, then the number of beats heard by the listener per second will be

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1ms−1. If the speed of sound is 330m∕s, then the number of beats heard by the listener per second will be

Q.30 In-correct

When a string is divided into three segments of length l1,l2 and l3 the fundamental frequencies of these three segments are υ1,υ2 and υ3 respectively. The original fundamental frequency (υ) of string is

When a string is divided into three segments of length l1,l2 and l3 the fundamental frequencies of these three segments are υ1,υ2 and υ3 respectively. The original fundamental frequency (υ) of string is

Q.31 In-correct

Two sources of sound placed close to each other, are emitting progressive waves given by y1=4sin600πt and y2=5sin608πt
An observer located near these two sources of sound will hear

Two sources of sound placed close to each other, are emitting progressive waves given by y1=4sin600πt and y2=5sin608πt
An observer located near these two sources of sound will hear

Q.32 In-correct

The equation of a simple harmonic wave is given by
y=3sin

(50t−x),
where x and y are in metres and t is in seconds. The ratio of maximum particle velocity to the wave velocity is

(2012 Mains)

The equation of a simple harmonic wave is given by
y=3sin

(50t−x),
where x and y are in metres and t is in seconds. The ratio of maximum particle velocity to the wave velocity is

(2012 Mains)

Q.33 In-correct

A train moving at a speed of 220ms−1 towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is (Speed of sound in air is 330ms−1)

(2012 Mains)

A train moving at a speed of 220ms−1 towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is (Speed of sound in air is 330ms−1)

(2012 Mains)

Q.34 In-correct

Two waves are represented by the equations
y1=asin(ωt+kx+0.57)m and
y2=acos(ωt+kx)m, where x is in meter and 7 in sec. The phase difference between them is

Two waves are represented by the equations
y1=asin(ωt+kx+0.57)m and
y2=acos(ωt+kx)m, where x is in meter and 7 in sec. The phase difference between them is

Q.35 In-correct

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air

Q.36 In-correct

Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be

(2011 Mains)

Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be

(2011 Mains)

Q.37 In-correct

A transverse wave is represented by y=Asin(ωt−kx).For what value of the wavelength is the wave velocity equal to the maximum particle velocity?

A transverse wave is represented by y=Asin(ωt−kx).For what value of the wavelength is the wave velocity equal to the maximum particle velocity?

Q.38 In-correct

A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

Q.39 In-correct

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is

Q.40 In-correct

The driver of a car travelling with speed 30 m/sec towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s, the frequency of reflected sound as heard by driver is

The driver of a car travelling with speed 30 m/sec towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s, the frequency of reflected sound as heard by driver is

Q.41 In-correct

A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 m/sec and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is

A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 m/sec and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is

Q.42 In-correct

A point performs simple harmonic oscillation of period T and the equation of motion is given by x=asin(ωt+

).After the elapse of what fraction of the time period thevelocity of the point will be equal to half of its maximum velocity?

A point performs simple harmonic oscillation of period T and the equation of motion is given by x=asin(ωt+

).After the elapse of what fraction of the time period thevelocity of the point will be equal to half of its maximum velocity?

Q.43 In-correct

Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is

Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is

Q.44 In-correct

The wave described by y=0.25‌sin(10πx−2πt), where x and y are in meters and 7 in seconds, is a wave travelling along the

The wave described by y=0.25‌sin(10πx−2πt), where x and y are in meters and 7 in seconds, is a wave travelling along the

Q.45 In-correct

Two vibrating tuning forks produce waves given by y1=4‌sin‌500‌π‌t and y2=2‌sin‌506‌π‌tNumber of beats produced per minute is

Two vibrating tuning forks produce waves given by y1=4‌sin‌500‌π‌t and y2=2‌sin‌506‌π‌tNumber of beats produced per minute is

Q.46 In-correct

Two sound waves with wavelengths 5.0m and 5.5m respectively, each propagate in a gas with velocity 330m∕s. We expect the following number of beats per second.

Two sound waves with wavelengths 5.0m and 5.5m respectively, each propagate in a gas with velocity 330m∕s. We expect the following number of beats per second.

Q.47 In-correct

The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A ?

The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A ?

Q.48 In-correct

A transverse wave propagating along x -axis is represented by y(x,t)=8.0‌sin(0.5πx−4πt−

) where x is in metres and t is in seconds. The speed of the wave is

A transverse wave propagating along x -axis is represented by y(x,t)=8.0‌sin(0.5πx−4πt−

) where x is in metres and t is in seconds. The speed of the wave is

Q.49 In-correct

Which one of the following statements is true?

Which one of the following statements is true?

Q.50 In-correct

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P andQ is

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P andQ is

Q.51 In-correct

The phase difference between two waves, represented by
y1=10−6‌sin[100t+(

)+0.5]‌m
y2=10−6‌cos[100t+(

)]‌m
where x is expressed in metres and t is expressed in seconds, is approximately.

The phase difference between two waves, represented by
y1=10−6‌sin[100t+(

)+0.5]‌m
y2=10−6‌cos[100t+(

)]‌m
where x is expressed in metres and t is expressed in seconds, is approximately.

Q.52 In-correct

A car is moving towards a high cliff. The driver sounds a horn of frequency f. The reflected sound heard by the driver has frequency 2f. If v is the velocity of sound, then the velocity of the car, in the same velocity units, will be

A car is moving towards a high cliff. The driver sounds a horn of frequency f. The reflected sound heard by the driver has frequency 2f. If v is the velocity of sound, then the velocity of the car, in the same velocity units, will be

Q.53 In-correct

An observer moves towards a stationary source of sound with a speed

‌th of the speed of sound. The wavelength and frequency of the source emitted are lambda and f respectively. The apparent frequency and wavelength recorded by the observer are respectively

An observer moves towards a stationary source of sound with a speed

‌th of the speed of sound. The wavelength and frequency of the source emitted are lambda and f respectively. The apparent frequency and wavelength recorded by the observer are respectively

Q.54 In-correct

A whistle revolves in a circle with angular speed ω=20‌rad∕s using a string of length 50cm. If the frequency of sound from the whistle is 385Hz, then what is the minimum frequency heard by an observer which is far away from the centre (velocity of sound =340m∕s)

A whistle revolves in a circle with angular speed ω=20‌rad∕s using a string of length 50cm. If the frequency of sound from the whistle is 385Hz, then what is the minimum frequency heard by an observer which is far away from the centre (velocity of sound =340m∕s)

Q.55 In-correct

If a wave travelling in positive x-direction with A=0.2m∕s, velocity =360m∕s and λ=60m, then correct expression for the wave is:

If a wave travelling in positive x-direction with A=0.2m∕s, velocity =360m∕s and λ=60m, then correct expression for the wave is:

Q.56 In-correct

The equation of a wave is represented by y=10−4‌sin(100t−

)‌m, then the velocityof wave will be

The equation of a wave is represented by y=10−4‌sin(100t−

)‌m, then the velocityof wave will be

Q.57 In-correct

Two waves having equation
x1=a‌sin(ωt−kx+ϕ1)
x2=a‌sin(ωt−kx+ϕ2)
If in the resultant wave the frequency and amplitude remain equal to amplitude of superimposing waves, the phase difference between them is

Two waves having equation
x1=a‌sin(ωt−kx+ϕ1)
x2=a‌sin(ωt−kx+ϕ2)
If in the resultant wave the frequency and amplitude remain equal to amplitude of superimposing waves, the phase difference between them is

Q.58 In-correct

If the tension and diameter of a sonometer wire of fundamental frequency n is doubled and density is halved then its fundamental frequency will become

If the tension and diameter of a sonometer wire of fundamental frequency n is doubled and density is halved then its fundamental frequency will become

Q.59 In-correct

The equations of two waves acting in perpendicular directions are given as
x=a‌cos(ωt+δ) and y=a‌cos(ωt+α)
where δ=α+

, the resultant wave represents

The equations of two waves acting in perpendicular directions are given as
x=a‌cos(ωt+δ) and y=a‌cos(ωt+α)
where δ=α+

, the resultant wave represents

Q.60 In-correct

A string is cut into three parts, having fundamental frequencies n1,n2,n3 respectively. Then original fundamental frequency n related by the expression as

A string is cut into three parts, having fundamental frequencies n1,n2,n3 respectively. Then original fundamental frequency n related by the expression as

Q.61 In-correct

Two stationary sources each emitting waves of wavelength λ, an observer moves from one source to another with velocity u. Then number of beats heard by him

Two stationary sources each emitting waves of wavelength λ, an observer moves from one source to another with velocity u. Then number of beats heard by him

Q.62 In-correct

Two waves of lengths 50cm and 51cm produced 12 beats per sec. The velocity of sound is

Two waves of lengths 50cm and 51cm produced 12 beats per sec. The velocity of sound is

Q.63 In-correct

A transverse wave is represented by the equation
y=y0‌sin‌

(vt−x)
For what value of λ, is the maximum particle velocity equal to two times the wave velocity?

A transverse wave is represented by the equation
y=y0‌sin‌

(vt−x)
For what value of λ, is the maximum particle velocity equal to two times the wave velocity?

Q.64 In-correct

A vehicle, with a horn of frequency n is moving with a velocity of 30m∕s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency n+n1. Then (if the sound velocity in air is 300m∕s)

A vehicle, with a horn of frequency n is moving with a velocity of 30m∕s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency n+n1. Then (if the sound velocity in air is 300m∕s)

Q.65 In-correct

A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21Å between them. The wavelength of the standing wave is

A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21Å between them. The wavelength of the standing wave is

Q.66 In-correct

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170s . The frequency of wave is

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170s . The frequency of wave is

Q.67 In-correct

Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m∕s, the frequency is

Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m∕s, the frequency is

Q.68 In-correct

A cylindrical tube, open at both ends has fundamental frequency f in air. The tube is dipped vertically in water, so that half of it is in water. The fundamental frequency of air column is now

A cylindrical tube, open at both ends has fundamental frequency f in air. The tube is dipped vertically in water, so that half of it is in water. The fundamental frequency of air column is now

Q.69 In-correct

The equation of a sound wave is
y=0.0015‌sin(62.4x+316t)
The wavelength of this wave is

The equation of a sound wave is
y=0.0015‌sin(62.4x+316t)
The wavelength of this wave is

Q.70 In-correct

Two sound waves having a phase difference of 60° have path difference of

Two sound waves having a phase difference of 60° have path difference of

Q.71 In-correct

The length of a sonometer wire AB is 110cm. Where should the two bridges be placed from A to divide the wire in 3 segments whose fundamental frequencies are in the ratio of 1:2:3?

The length of a sonometer wire AB is 110cm. Where should the two bridges be placed from A to divide the wire in 3 segments whose fundamental frequencies are in the ratio of 1:2:3?

Q.72 In-correct

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2MHz. The speed of sound in a tissue is 1.7km∕s. The wavelength of sound in the tissue is close to

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2MHz. The speed of sound in a tissue is 1.7km∕s. The wavelength of sound in the tissue is close to

Q.73 In-correct

A source of sound gives 5 beats per second, when sounded with another source of frequency 100 second −1. The second harmonic of the source, together with a source of frequency 205sec−1 gives 5 beats per second. What is the frequency of the source?

A source of sound gives 5 beats per second, when sounded with another source of frequency 100 second −1. The second harmonic of the source, together with a source of frequency 205sec−1 gives 5 beats per second. What is the frequency of the source?

Q.74 In-correct

A star, which is emitting radiation at a wavelength of 5000Å, is approaching the earth with a velocity of 1.5×104m∕s. The change in wavelength of the radiation as received on the earth is

A star, which is emitting radiation at a wavelength of 5000Å, is approaching the earth with a velocity of 1.5×104m∕s. The change in wavelength of the radiation as received on the earth is

Q.75 In-correct

Which one of the following represents a wave?

Which one of the following represents a wave?

Q.76 In-correct

A wave of frequency 100Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10cm from the fixed end. The speed of the wave (incident and reflected) is

A wave of frequency 100Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10cm from the fixed end. The speed of the wave (incident and reflected) is

Q.77 In-correct

A stationary wave is represented by y=A‌sin(100t)‌cos(0.01x), where y and Aare in millimetres, t is in seconds and x is in metres. The velocity of the wave is

A stationary wave is represented by y=A‌sin(100t)‌cos(0.01x), where y and Aare in millimetres, t is in seconds and x is in metres. The velocity of the wave is

Q.78 In-correct

A source of frequencyv gives 5 beats/second when sounded with a source of frequency 200Hz. The second harmonic of frequency 2υ of source gives 10 beats/second when sounded with a source of frequency 420Hz. The value of υ is

A source of frequencyv gives 5 beats/second when sounded with a source of frequency 200Hz. The second harmonic of frequency 2υ of source gives 10 beats/second when sounded with a source of frequency 420Hz. The value of υ is

Q.79 In-correct

Wave has simple harmonic motion whose period is 4 seconds while another wave which also possesses simple harmonic motion has its period 3 second. If both are combined, then the resultant wave will have the period equal to

Wave has simple harmonic motion whose period is 4 seconds while another wave which also possesses simple harmonic motion has its period 3 second. If both are combined, then the resultant wave will have the period equal to

Q.80 In-correct

A stretched string resonates with tuning fork frequency 512Hz when length of the string is 0.5m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256Hz would be

A stretched string resonates with tuning fork frequency 512Hz when length of the string is 0.5m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256Hz would be

Q.81 In-correct

The temperature at which the speed of sound becomes double as was at 27°C is

The temperature at which the speed of sound becomes double as was at 27°C is

Q.82 In-correct

For production of beats the two sources must have

For production of beats the two sources must have

Q.83 In-correct

The frequency of sinusodial wave
y=0.40‌cos[2000t+0.80] would be

The frequency of sinusodial wave
y=0.40‌cos[2000t+0.80] would be

Q.84 In-correct

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

Q.85 In-correct

Two trains move towards each other with the same speed. The speed of sound is 340m∕s. If the height of the tone of the whistle of one of them heard on the other changes to

times, then the speed of each train should be

Two trains move towards each other with the same speed. The speed of sound is 340m∕s. If the height of the tone of the whistle of one of them heard on the other changes to

times, then the speed of each train should be

Q.86 In-correct

A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has

A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has

Q.87 In-correct

Velocity of sound waves in air is 330m∕s For a particular sound wave in air, a path difference of 40cm is equivalent to phase difference of 1.6π. The frequency of this wave is

Velocity of sound waves in air is 330m∕s For a particular sound wave in air, a path difference of 40cm is equivalent to phase difference of 1.6π. The frequency of this wave is

Q.88 In-correct

A 5.5 metre length of string has a mass of 0.035kg. If the tension in the string in 77N, the speed of a wave on the string is

A 5.5 metre length of string has a mass of 0.035kg. If the tension in the string in 77N, the speed of a wave on the string is

Q.89 In-correct

If the amplitude of sound is doubled and the frequency reduced to one fourth, the intensity of sound at the same point will be

If the amplitude of sound is doubled and the frequency reduced to one fourth, the intensity of sound at the same point will be

Q.90 In-correct

The velocity of sound in any gas depends upon

The velocity of sound in any gas depends upon

Q.91 In-correct

Equation of progressive wave is given by y=4‌sin[π(

] where y,x are in cm and t is in seconds. Then which of the following is correct?

Equation of progressive wave is given by y=4‌sin[π(

] where y,x are in cm and t is in seconds. Then which of the following is correct?

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