Question

In an `alpha` -decay, the kinetic energy of `alpha`-particles is `48 MeV` and `Q` value of the reaction is `50 MeV`. The mass number of the mother nucleus is (assume that daughter nucleus is in ground state)
A. 96
B. 100
C. 104
D. None of these

Answer 1

Correct Answer - B
`K_(alpha) = (A-4)/(A) Q rArr 48 = (A-4)/(A) 50 rArr A = 100`