A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
A
1/32
B
1/16
C
1/8
D
1/4
E
1/2
Verified Correct Answer: B.
Physical Principles & Numerical Solution
1 → 1/2 → 1/4 → 1/8 → 1/16
Source: Myschool Past Questions Archive (Record #24168)