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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 β decay is Q1 and that for a β + 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 – 2me)c

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

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

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

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

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