Q. A radioactive decay chain starts from $\ _{92}Np^{237}$ produces $\ _{90}Th^{229}$ by successive emissions. The emitted particles can be
A) Two $\alpha$-particles and one $\beta$-particle
B) Three $\beta^{+}$ particles
C) One $\alpha$-particle and two $\beta^{+}$ particles
D) One $\alpha$-particle and two $\beta^{-}$ particles
Explanation
(a) By using $n_{\alpha} = \frac{A - A^{'}}{4}$ and $n_{\beta} = 2n_{\alpha} - Z + Z'$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.