Modern Physics Ques 186

Answer:

Correct Answer: 186.(c)

Solution:

Formula:

Alpha - Decay Process:

186. Energy is released in a process when total binding energy of the nucleus ( $=$ binding energy per nucleon $\times$ number of nucleons) is increased or we can say, when total binding energy of products is more than the reactants. By calculation we can see that only in option (c), this happens.

Given :

$$ W \rightarrow 2 Y $$

Binding energy of reactants $=120 \times 7.5=900 MeV$

and binding energy of products $=2(60 \times 8.5)$

$$ =1020 MeV>900 MeV $$