NEET 2004 Physics question

In a pn junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to: -

(1)The intensity of the light falling on the cellCorrect
(2)The frequency of the light falling on the cell
(3)The voltage applied at the pn junction
(4)The barrier voltage at the pn junction

Answer: (1)

Solution

In a photovoltaic (p-n junction) cell, light of energy greater than the band gap generates electron-hole pairs; the number generated, and hence the photo current and the photo emf produced, is proportional to

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Question ID VK-089375