Wave Optics — Physics STD 12 Science — Question

For diffraction of light, it is necessary that the size of the obstacle in comparison to the wavelength of light waves will be :

A conducting resistor is joined with a battery. If the temperature of the conductor is changed with the cooling process, then the magnitude of current flowing:

What happens when some charge is placed on a soap bubble?

The dimensions of volume charge density is:

Light waves can be polarised as they are(a) Transverse(b) Of high frequency(c) Longitudinal(d) Reflected

Stopping potential for photoelectrons(a) Does not depend on the frequency of the incident light(b) Does not depend upon the nature of the cathode material(c) Depends on both the frequency of the incident light and nature of the cathode material(d) Depends upon the intensity of the incident light

In an elastic collision:

1. The initial kinetic energy is equal to the final kinetic energy.
2. The final kinetic energy is less than the initial kinetic energy.
3. The kinetic energy remains constant.
4. The kinetic energy first increases then decreases.

Ionization potential of hydrogen atom is 13.6 V.
Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atoms according to Bohr's theory will be(a) One   (b) Two(c) Three(d) Four