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The intensity of gamma radiation from a ...

The intensity of gamma radiation from a given source is `I`. On passing through 27 mm of lead, it is reduced to `I//8`. The thickness of lead which will reduce the intensity to `I//2` will be:

A

`18 mm`

B

`12mm`

C

`6 mm`

D

`9 mm`

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The correct Answer is:
B
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