State the nature and any four properties of `gamma`-rays.

Explanation

Nature of `gamma`-rays:
(1) `gamma`-rays are electromagnetic waves of very short wavelength, about (2) They are uncharged.
Properties of-rays : (1) `gamma`-rays produce feeble ionisation. Their ionising power is 10 times less than that of a-particles and 100 times less than that of B-particles.
(2) They are not deflected by electric and magnetic fields as they are uncharged.
(3) They affect photographic plates.
(4) They cause fluorescence in a fluorescent material such as zinc sulphide.
(5) `gamma`-rays can be diffracted by crystals