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 Mx and My denote the atomic masses of the parent and the daughter nuclei respectively in a radioactive decay. The Q-value for a \beta- decay is Q1 and that for a \beta+ decay is Q2. If me denotes the mass of an electron, then which of the following statements is correct?

(a) Q1 = (Mx – My)c2 and Q2 = (Mx – My )c2

(b) Q1 = (Mx – My)c2 and Q2 = (Mx – My – 2me )c2

(c) Q1 = (Mx – My– 2me)c2 and Q2 = (Mx – My +2me )c2

(d) Q1 = (Mx – My + 2me )c2  and Q2 = (Mx – My +2me )c2

Answers (1)

The answer is the option (b) Q1 = (Mx – My) c2 and Q2 = (Mx – My – 2me )c2

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