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The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I/8.

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The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I/8. The thickness of lead which will reduce the intensity to I/2 will be

(a) 6 mm

(b) 9 mm

(c) 18 mm

(d) 12 mm

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Correct Option (d) 12 mm

Explanation:

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