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which a U^(238) nucleus original at rest...

which a `U^(238)` nucleus original at rest , decay by emitting an alpha particle having a speed `u` , the recoil speed of the residual nucleus is

A

`-4v//234`

B

`v//4`

C

`-4v//238`

D

`4v//238`

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The correct Answer is:
A
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