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Intensity of gamma rays from the given s...

Intensity of `gamma` rays from the given source is `I_0`. On passing through X m of lead, it is reduced to `I0//8`. Thickness of lead which will reduce it to `(I_0//2)` in m is

A

`X//2`

B

`X//3`

C

`X//8`

D

`X//4`.

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