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A parallel beam of monochromatic light of wavelength 6620 A striking a metal surface perpendicular...

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A parallel beam of monochromatic light of wavelength 6620 A striking a metal surface perpendicular has an intensity of 900 W m The number of photon striking the matal surface per unit area per second is O 3 x 1021 3 x 1019 4x1021 4x1019

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