A radioactive nucleus undergoes α-emission to form a stable element. What will be the recoil velocity of the daughter nucleus if V is the velocity of α-emission and A is the atomic mass of radioactive nucleus?
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a
4vA-4
b
2vA-4
c
4vA+4
d
2vA+4
answer is A.
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Detailed Solution
According conservation of momentum4v=(A-4)v'⇒v'=4vA-4.