A beam of 800 kev gamma is mormally incident on a sheet of, Physics

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A beam of 800 kev gamma is mormally incident on a sheet of

A beam of 800 keV gamma is mormally incident on a sheet of lead 12mm thick. the rate of energy transmission is 3x10^5 MeV s^-1.

a) What fraction of the incident photon energy is absorbed in the sheet?
b) How many photons per second are incident on the sheet?
c) What fraction of the transmitted energy is due to uncollided photons?

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