When a nucleus in an atom undergoes radioactive decay, the electronic energy levels of the atom
(a) change for -radioactivity but not for others
(b) change for -radioactivity but not for others
(c) do not change for any type of radioactivity
(d) change for α and radioactivity but not for γ-radioactivity
The answer is the option (b) change for and radioactivity but not for γ-radioactivity