The intensity of gamma radiation from a given source is L. 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

Atoms and Nuclei: JEE Main 2005 Physics question

JEE Main 2005 · Annual, Paper 1 · Q6078

JEE Main 2005Annual, Paper 1PhysicsMediumAtoms and Nuclei183× since 2002

The intensity of gamma radiation from a given source is

L

. On passing through

36

mm

of lead, it is reduced to

{{\rm I} \over 8}.

The thickness of lead which will reduce the intensity to

{{\rm I} \over 2}

will be