Question

Q 11

​Q11. The intensity of gamma radiation from a given source is 1. 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 :

(A) 6 mm (B) 9 mm (C) 18 mm (D) 12 mm

Answer 1

I think C 18 mm hope it helps.....m