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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 = (M_x – M_y)c² and Q₂ = (M_x – M_y )c²

(b) Q₁ = (M_x – M_y)c² and Q₂ = (M_x – M_y – 2me )c²

(c) Q₁ = (M_x – M_y– 2me)c² and Q₂ = (M_x – M_y +2me )c²

(d) Q₁ = (M_x – M_y + 2me )c² and Q₂ = (M_x – M_y +2me )c²

Answers (1)

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

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