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The ejection of the photoelectron from the silver metal in the photonelectric effect exeriment can be stopped by applying the voltage of `0.35 V` when the radiation `256.7 nm` is used. Calculate the work function for silver metal. |
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Answer» Energy of incident radiation = Work function + Kinetic energy of photoelectron Energy of incident raidation `(E)` `=hv=h c/lambda` `=((6.626xx10^(-34)J s)(3.0xx10^(8) m s^(-1)))/((256.7xx10^(-9)m))` `=7.74xx10^(-19)J` `=4.83 eV(1 eV=1.602xx10^(-19)J)` The potential applied gives the kinetic energy to the electron. Hence, kinetic energy of the elecyron`=0.35 eV` :. Work function `4.83 eV-0.35 eV=4.48 eV` |
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