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A photoelectric material having work-fun...

A photoelectric material having work-function `phi_(0)` is illuminated with light of wavelength `lamda(lamdalt(hc)/(4_(0))).` The fastest photoelectron has a de Broglie wavelength `lamda_(d).` A change in wavelength of the incident light by `Deltalamda` results in a change `Deltalamda_(d)` in `lamda_(d).` Then the ration `Deltalamda_(d)//Deltalamda` is proportional to

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