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A radioactive element has a half-life of...

A radioactive element has a half-life of 20 minutes. How much time should elapse before the element is reduced to `(1)/(8)th` of the original mass

A

40 min

B

60 min

C

80 min

D

160 min

Text Solution

Verified by Experts

The correct Answer is:
B
`t_(1//2) = 20 ` minutes , `N = 1/9 N_0`
Use `t = (2.303)/(0.693) xx t_(1//2) log"" (N_0)/(N)`
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