NEET Physics Nuclei Questions Solved

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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 
(a) 4VA-4             (b) 2VA-4
(c) 4VA+4             (d) 2VA+4

(a) 

According to conservation of momentum 4v=A-4v'v'=4vA-4 .

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