Q. A radioactive sample with a half life of 1 month has the label: “Activity $= 2\ micro\ curies$ on 1.8.1991.” What will be its activity two months later
A) $1.0\ micro\ curies$
B) $0.5\ micro\ curies$
C) $4\ micro\ curies$
D) $8\ micro\ curies$
Explanation
(b) In two half lives, the activity becomes one fourth
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.