1.

A radioactive nucleus undergoes a-emission to form a stable element. What will be the recoil velocity of the daughter nucleus if V is the velocity of a-emission and A is the atomic mass of radioactive nucleus                               [DCE 2000; AIIMS 2004]

A.            \[\frac{4V}{A-4}\]              
B.            \[\frac{2V}{A-4}\]
C.            \[\frac{4V}{A+4}\]             
D.            \[\frac{2V}{A+4}\]
Answer» B.            \[\frac{2V}{A-4}\]


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