Suppose that we repeat the same experiment we did in the
previous exercise (Exercise 17.12), but in this case, we replace the aluminum
plate with a lead plate 20 cm thick. How many times more likely is the 0.5
MeV gamma ray to be absorbed halfway through the plate than the 5 MeV gamma ray
A beam of 5 MeV gamma rays and a beam of 0.5 MeV gamma rays
both hit an aluminum plate. If the plate is 20 cm thick, how many times
more likely is the 0.5 MeV gamma ray to be absorbed than the 5 MeV gamma ray at
half the distance through the plate?