A beam of 5 MeV gamma rays and a beam of 0.5 MeV gamma rays both hit an aluminum plate. If the plate

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?

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