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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

24

Text Solution

Verified by Experts

The correct Answer is:
D
`(1)/(64)=((1)/(2))^(n) or ((1)/(2))^(6)=((1)/(2))^(n)`
`therefore n=6`
Time to work safely `=6xx2="24 hours"`
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