Give any three properties of `beta`- rays.

Explanation

Nature of `(beta)`-particles: `(beta)`-particle is an electron or a positron
Properties of f-particles:
(1) `(beta)`-particles have a moderate ionising power. It is about 100 times less than that of `(propto)`-particles, but 100 times more than that of y-rays.
(2) They are deflected by electric and magnetic fields. Their deflection is more than the deflection of aparticles in the same field but in the opposite direction.
(3) They affect photographic plates.
(4) They cause fluorescence in a fluorescent material such as zinc sulphide.
(5) Their speeds are in range of about 0 to 0.99 c, where c is the speed of light in free space.