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In a PN junction photo cell, the value of photo-electromotive force produced by monochromatic light is proportional to
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The intensity of the light falling on the cell
When a light (wavelength sufficient to break the covalent bond) falls on the junction, new hole electron pairs are created. No. of produced electron hole pair deponed upon no. of photons. So photo emf or current proportional to intensity of light.
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