the transverse nature of light is shown by the polarization of light.

We know that

Clearly, we can see that energy is inversely proportional to the wavelength of x- rays

As the energy of X-rays of wavelength 2 A is maximum, hence it will penetrate the most.

In dc ammeter, a coil is free to rotate in the magnetic field of another fixed magnetic. If an alternating current is passed through the fixed magnet. The magnetic field will reverse its direction with a frequency equal to the alternating current frequency. The direction of torque also changes, average torque will be zero.

AC instruments are based on the heating effect of the current.It will get damaged if connected for a long time.

So, option D is current.

The energy required for the conservation of momentum = -(-30.6) eV

= 30.6 eV

So,option B is correct.

As the temperature increases the length of the tuning fork increases then the frequency of the tuning fork decreases because the frequency of tuning fork is inversely proportional to the length.

internal energy is a state function. Its value depends only on the initial and final position .change in internal energy does not depend upon the path, followed by the process. So, change in internal energies does not depend upon both

it is given by Wien’s law

The direction of current in the wire AB and CD pass through O. hence these wire do not contribute to the magnetic induction at O. the field due to wire DA is out of the paper and that due to wire BC is into the paper.

If the phase difference between V and I is π/2.

Since Power is 0 it should only consists of reactive elements (L&C), Resistance R cannot be present.