1.

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 [AIEEE 2005]

A.             18 mm                                     
B.             12 mm
C.             6 mm                                        
D.             9 mm
Answer» C.             6 mm                                        


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