Question

which of the following decay(s) will definitely takes place when n/p ratio for a radioactive nuclei lies below the stability belt
(A) k electron capture
(B) both a and b
(c) alpha decay
(d) positron decay
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Answer 1

(d) positron decay

Explanation:

When n/p ratio for a radioactive nuclei lies below the stability belt, positron decay takes place. For the element to be stable, n/p ratio needs to be increased. This can be achieved by either increasing the number of protons or decreasing the number of neutrons.

Option D is the answer.