Question: Consider an electric circuit containing a light-sensitive element with a work function of 2.80 10^19 J. Monochromatic light of wavelength 7.00 10^7 m is shone

Consider an electric circuit containing a light-sensitive element with a work function of 2.80 10^19 J. Monochromatic light of wavelength 7.00 10^7 m is shone on the light-sensitive element in a beam with a constant power of 2.50 10^3 W.How many photons from the beam are incident on the light-sensitive element per second

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