(b) Which one α, β and γ radiation has the least penetrating power?
Solution:
(a) Alpha radiations have a double positive charge since they are made up of two protons and two neutrons. Beta radiations are negatively charged and made up of fast-moving electrons. Photons or electromagnetic waves, such as X rays, make up gamma radiations.
(b) Alpha radiations are the ones with the least penetrating power.