The linear attenuation coefficients of 300 keV γ-rays for lead is 4.5 cm−1. Determine the half-value layer for this material.

it has to be b, about 97 percent.

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.