Question: Q. 2. When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom
(a) do not change for any type of radioactivity.
(b) change for $\alpha$ and $\beta$ radioactivity but not for $r$ radioactivity.
(c) change for $\alpha$ radioactivity but not for others.
(d) change for $\beta$ radioactivity but not for others.
[NCERT Exemplar]
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Solution:
Ans. Correct option : (b)
Explanation: As we know that, $\alpha$-particle : 2 unit of positive charge $\beta$-particles : 1 unit positive charge $\gamma$-particles : No dharge
Due to thisreasen, energy levels of the atom change for $\alpha$ and $\beta$ bet not for others.
So the eleetronic energy level of the atom changes ine isission of $\alpha$ and $\beta$ particle, but not in $\gamma$ decay.
