After 2 hours, a radioactive substance becomes\(\left(\frac{1}{16}\right)^{4}\) of original amount. Then the half life ( in min ) is ………
A. 60 minutes
B. 120 minutes
C. 30 minutes
D. 15 minutes
Answer:C
After 2 hours, a radioactive substance becomes\(\left(\frac{1}{16}\right)^{4}\) of original amount. Then the half life ( in min ) is ………
A. 60 minutes B. 120 minutes C. 30 minutes D. 15 minutes