Q. The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:
A) isomer of parent
B) isotone of parent
C) isotope of parent
D) isobar of parent
Explanation
[Solution from source] One α emission lowers Z by 2 and A by 4; two β⁻ emissions raise Z by 2 and leave A unchanged. Net: same Z, A reduced by 4, so the daughter is an isotope of the parent, not an isobar (same mass number). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.