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A freshly prepared radioactive sample of...

A freshly prepared radioactive sample of half-life 4 hours emits radiation of intensity which is 64 times the safe level. The minimum hours after which it would be safe to work with it is

A

4

B

6

C

12

D

16

Text Solution

Verified by Experts

`T_(1//2)= 4` hr
Since, `(1)/(64) = ((1)/(2))^(6) rArr ((1)/(2))^(6) = ((1)/(2))^(n)`
n=6
Time to work safely `=6 xx 4= 24` hr
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