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

Mx and My denote the atomic masses of the parent and the daughter nucl

1.	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)c2 (b) Q1 = (Mx – My) c2 and Q2 = (Mx – My )c2 (c) Q1 = (Mx – My – 2me) c2 and Q2 = (Mx – My +2 me)c2 (d) Q1 = (Mx – My + 2me) c2 and Q2 = (Mx – My +2 me)c2
Answer» (a) Q₁ = (M_x – M_y) c² and Q₂ = (M_x – M_y – 2m_e)c²

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