Alpha particle decay is possible if

Moderate

A

rest mass of the original (parent) nucleus is lesser than the sum of the rest masses of the alpha particle and the daughter nucleus.
B

rest mass of the original (parent) nucleus is greater than the sum of the rest masses of the alpha particle and the daughter nucleus.
C

rest mass of the original (parent) nucleus is equal to the sum of the rest masses of the alpha particle and the daughter nucleus
D

rest mass of the original (parent) nucleus is zero.

Solution

For the alpha decay $Q > 0$

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