A) 15
B) 30
C) 45
D) 60
Correct Answer: D
Solution :
Number of active nuclei falls from 60% to 15% So sample becomes \[\frac{1}{4}th\] \[=\frac{1}{{{2}^{2}}}th\] So number of half-lives = 2 Time \[t=2\times 30=60\]minuteYou need to login to perform this action.
You will be redirected in
3 sec