Given that photon of light of wavelength 10000 Ao has an energy equal to 1.23 eV. When a light of wavelength 5000Ao adn intnsity I falls on photoelectric cell, the surface current is 0.40 X 106 A. Stopping potential is 1.36eV, then what is the work function? (1 Ao = 10-10m)

Energy of a photon the 1st radiation,

According to the problem,

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