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M(x)andM(y) denote the atomic masses of ...

`M_(x)andM_(y)` denote the atomic masses of the parent and the daughter nuclei respectively, in radioactive decay. The Q-value for a `beta^(-)` decay is `Q_(1)` and that for a `beta^(-)` decay is `Q_(2)`. If `m_(e)` denotes the mass of an electron, then which of the following statements is correct?

A

`Q_(1) = (M_(x) - M_(y))C^(2) " " Q_(2) = (m_(x) - M_(y) -2m_(e))C^(2)`

B

`Q_(1) = (M_(x) - M_(y))C^(2) " " Q_(2) = (m_(x) - M_(y) )C^(2)`

C

`Q_(1) = (M_(x) - M_(y) - 2m_(c ))C^(2) " " Q_(2) = (m_(x) - M_(y) +2m_(e))C^(2)`

D

`Q_(1) = (M_(x) - M_(y) + 2m_(c ))C^(2) " " Q_(2) = (m_(x) - M_(y) -2m_(e))C^(2)`

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The correct Answer is:
A
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