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Question

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
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B
6
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C
12
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D
16
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E
24
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Solution

The correct option is E 24
According to question
I64I0=(12)t/T
(12)6=(12)t/T
tT=6 t4=6
t=24h

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