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A monochromatic beam of electromagnetic radiation has an intensity of `1W//m^2`. Then the average number of photons per `m^3` for a 10MeV `gamma` rays

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A monochromatic beam of electromagnetic radiation has an intensity of `1W//m^2`. Then the average number of photons per `m^3` for a 10MeV `gamma` rays is
A. 4166
B. 3000
C. 5000
D. 2083
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Correct Answer - D
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