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A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m2 . The number of photons in 1mm3 of this radiation are ….

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A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m2 . The number of photons in 1mm3 of this radiation are ….

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Solution is 884 photons/mm3 

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