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Stopping Potential vs Intensity

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The surface of a metal is illuminated with the light ofWavelength 400 nm. The kinetic energy of theejected photoelectrons was found to be 1.68 eV.Work function of the metal is about(1) 3.09 eV(3) 4.73 ev(2) 1.42 eV(4) 0.68 ev

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Q. The surface of the metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV, the work function of metal is :

Q. The surface of a metal is illuminated with the light of

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