Question

In ana-decay the kinetic energy of a-particle 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

Answer: (B)

100

Answer 2

K_a = $\left( \frac { A - 4 } { A } \right)$ Q

48 = 50

48A = 50A – 200

200 = 2A

A = 100