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Question

At t = 0, light of intensity 1012photonssm2 of energy 6eV per photon start falling on a plate with work function 2.5 eV. If area of the plate is 2×104m2 and for every 105 photons one photoelectron is emitted, charge on the plate at t = 25 s is

A
8×1014C
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B
4×1014C
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C
12×1014C
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D
16×1014C
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Solution

The correct option is A 8×1014C
Number of emitted electrons =1012×2×104×25105=5×104 electrons
q=ne=8×1014C.

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