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Waves Test - 21
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Waves Test - 21

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  • Question 1/10
    4 / -1

  • Question 2/10
    4 / -1
    An open pipe is in resonance in 2nd harmonic with frequency v1. Now, one end of the tube is closed and frequency is increased to v2, such that the resonance again occurs in nth harmonic. Choose the correct option.
  • Question 3/10
    4 / -1
    A transverse wave propagating on a stretched string of linear density 3 × 10-4 kg – m-1 is represented by the equation, y = 0.2 sin (1.5x + 60t ), where, x is in metre and t is in second. The tension in the string (in newton) is
  • Question 4/10
    4 / -1
    An open tube is in resonance with string. If tube is dipped in water, so that 75% of length of tube is inside water, then the ratio of the frequency (v0 ) of tube to string is
  • Question 5/10
    4 / -1
    Two vehicles, each moving with speed u on the same horizontal straight road, are approaching each other. Wind blows along the road with velocity. One of these vehicles blows a whistle of frequency f1 . An observer in the other vehicle hears the frequency of the whistle to be f2. The speed of sound in still air is v. The correct statement(s) is (are)
  • Question 6/10
    4 / -1
    A sound source is moving towards stationary listener with 1/10th of the speed of the sound. The ratio of apparent to real speed will be
  • Question 7/10
    4 / -1
    A stationary source is emitting sound at a fixed frequency f0, which is reflected by two cars approaching the source. The difference between the frequencies of sound reflected from the cars is 1.2% of f0. What is the difference in the speeds of the cars (in km per hour) to the nearest integer? The cars are moving at constant speeds much smaller than the speed of sound which is 330 ms -1.
  • Question 8/10
    4 / -1
    The speed of sound in air is 340 m/s. The speed with which a source of sound should move towards a stationary observer, so that the apparent frequency becomes twice of the original is
  • Question 9/10
    4 / -1
    A bat flies at a steady speed of 4 ms-1 emitting a sound of f = 90 × 103 Hz. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take, velocity of sound in air as 330 ms -1 )
    Solutions

  • Question 10/10
    4 / -1
    Two trains are moving towards each other with speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds whistle of frequency 600 Hz, the frequency of the whistle heard by a passenger in the second train before the train meets is (take, the speed of sound in air is 340 m/s)
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