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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

`(2u)/(238)`

B

`(3u)/(234)`

C

`(4u)/(234)`

D

`(5u)/(238)`

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The correct Answer is:
C
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