At t=0, light of intensity 1012 photons /s−m2 of energy 6eV per photon start falling on a plate with work function 2.5 eV. If area of the plate is 2×10−4m2 and for every 105 photons one photoelectron is emitted. Charge on the plate at t=25 sec is

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8×10−15C

4×10−14C

12×10−14C

16×10−14C

answer is A.

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Detailed Solution

Number of emitted electrons 1012×2×10−4×25105=5×104 electronsq=+ne=8×10−15C

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