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A freshly prepared radioactive source of...

A freshly prepared radioactive source of half-life `2 h` emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

A

`6h`

B

`12h`

C

`24h`

D

`28h`

Text Solution

Verified by Experts

The correct Answer is:
B
As `(N_(0))/N=2^(t//T),. (N_(0))/N=64/1=2^(t//T)`
`2^(6)=2^(t//T), t=6T`
`t=6xx2=12h`
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