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Q. The $Q$-value of a nuclear reaction and kinetic energy of the projectile particle, $K _{ p }$ are related as :

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Solution:

$x + p \rightarrow \gamma+ b$
$Q = k _{\gamma}+ k _{ b }- k _{ p }$
$Q + k _{ p }= k _{\gamma}+ k _{ b }$
$Q + k _{ p }>0$