The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to 1/8.
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to 1/8. The thickness of lead which will reduce the intensity to 1/2 will be
(1) 6 mm
(2) 9 mm
(3) 18 mm
(4) 12 mm
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