Q. In the nuclear reaction $\ _{92}U^{238} \rightarrow \ _{z}Th^{A} + \ _{2}He^{4}$, the values of $A$ and $Z$ are
A) $A = 234,\ Z = 94$
B) $A = 234,\ Z = 90$
C) $A = 238,\ Z = 94$
D) $A = 238,\ Z = 90$
Explanation
(b) $A = 238 - 4 = 234$ and $Z = 92 - 2 = 90$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.