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A radioactive nucleus of mass number A, ...

A radioactive nucleus of mass number A, initially at rest, emits an `alpha-` particle with a speed v. What will be the recoil speed of the daughter nucleus ?

A

`(4v)/(A-4)`

B

`(4v)/(A+4)`

C

`V/(a-4)`

D

`V/(a+4)`

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The correct Answer is:
A
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