Q. A radioactive substance has a half life of four months, three-fourth of the substance would decay in
A) 4 months
B) 3 months
C) 12 months
D) 8 months
โ Correct Answer: 8 months
Exam Insight
For a radioactive substance with a half-life of four months, three-fourths of the substance would decay in eight months, leaving one-fourth remaining.