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Q.

$α$ -decay of a parent nucleus X results in a daughter nucleus Y. If $m_{x}, m_{y}$ and $m_{α}$ are the masses of the parent nucleus, the daughter nucleus and the α - particle respectively, then the net kinetic energy gained in the process is

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a

$(m_{x} + m_{y} + m_{α}) c^{2}$

b

$(m_{x} - m_{y} - m_{α}) c^{2}$

c

$(m_{x} + m_{y} - m_{α}) c^{2}$

d

$(m_{x} + m_{α} - m_{y}) c^{2}$

answer is B.

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