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