The wavelength of X-rays is 0.01 Å . Calculate it's frequency. State the assumption made, if any.

For scattering of light, the necessary condition is that the size of air molecules should be …………… the wavelength of incident light.

1. smaller than
2. greater than
3. equal to
4. both (b) and (c)

In the white light of Sun, maximum scattering by the air molecules present in the earth’s atmosphere is for —

1. red colour
2. yellow colour
3. green colour
4. blue colour

Violet light is scattered nearly …………… times more than the red light.

1. 4
2. 8
3. 16
4. 9