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                                    The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I8. The thickness of lead which will reduce the intensity to l2 will be | 
                            
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Answer»  The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I8. The thickness of lead which will reduce the intensity to l2 will be  | 
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