Electron capture occurs more often than positron emission in heavy elements.
Heavy elements exhibit radioactivity.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

B

Explanation

(b) Electron capture occurs more often than positron emission in heavy elements. This is because if position emission is energetically allowed, electron capture is necessarily allowed, but the reverse is not true i.e., when electron capture is energetiacally allowed, positron emission is not necessarily allowed.