Question

Define the term radioactivity. Of the three normally occurring radioactive radiations:
(a) Which has a positive charge?
(b) Which is most penetrating?
(c) Which has no electric charge?

Answer 1

The phenomenon of spontaneous disintegration of an unstable nucleus of naturally occurring isotope accompanied by emission of active radiations a
particles, β particles and γ radiations is called radioactivity.
(a) α particles have positive charge.
(b) γ radiation is most penetrating.
( c) γ radiation has no electric charge.