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. `(4u)/(238)`
B. `-(4u)/(234)`
C. `(4u)/(234)`
D. `-(4u)/(238)`

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1 Answers

Correct Answer - C
`U^(238) rarr U^(234)+._(2)He^(4)`
Let recoil speed be V then by COLM
`234 V=4uimplies V=(4u)/234`

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