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How many photons-water interactions occur in one second in

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A beam of 2-MeV photons with intensity 10^8 cm^-2s^-1 irradiates a small sample of water. (a) How many photons-water interactions occur in one second in one cm^3 of the water? (b) How many positrons are produced per second in one cm^3 of the water?

Reference no: EM13613250

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