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Q.

The electric field associated with a light wave is given by E=E0sin1.57×107 m-1(x-ct).  Find the stopping potential (in eV) when this light is used in an experiment on photoelectric effect with a metal having work-function 1.9 eV.

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answer is 0001.20.

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Detailed Solution

Frequency , f=ω2π=1.57×107c2πHz​Energy, E=hf J=hf1.6×10−19eV=6.63×10−341.57×1073×1081.6×10−19×2×πeV=3.1eV​∴Kmax=E−ϕ=3.2−1.9=1.2eV​
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