Question

A mixture of radioactive substances gives off three types of radiations.
(a) Name these three types of radiations.
(b) Name the type of radiation consisting of the same kind of particles as cathode rays.
(c) One of these radiations is similar to X-rays. Name the radiation.
(d) When the particle referred to in (c) becomes neutral, it is found to be the atom of a rare gas. Name this rare gas.
[5 MARKS]

Answer 1

Part (a) : 2 Marks
Part (b) : 1 Mark
Part (c) : 1 Mark
Part (d) : 1 Mark

(a) Three types of radiations are $\alpha$ -particles, $\beta$ -particles and $\gamma$ -rays.
(b) Negatively charged $\beta$ -particles.
(c) $\gamma$ -radiations are similar to X-rays.
(d) Helium ${(}_2^{4}He)$.