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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

128h

Text Solution

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The correct Answer is:
B
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RESNICK AND HALLIDAY-THE NUCLEUS-PRACTICE QUESTIONS (Single Correct Choice Type)
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  2. Let T be the mean life of a radioactive sample. 75% of the active nucl...

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  10. Samples of two different isotopes, X and Y. Both contain the same numb...

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  12. A radioactive substance is dissolved in a liquid and the solution is h...

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