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Question

From a newly formed radioactive substance (Half-life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is

A
6 hours
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B
12 hours
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C
24 hours
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D
128 hours
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Solution

The correct option is B 12 hours
By using A=A0(12)nAA0=164=(12)6=(12)nn=6
tT12=6t=6×2=12 hours.

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