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Question

Assuming that the work function of the surface can be neglected, find the relation between the de-Broglie wavelength (λ) of the electrons emitted to the energy (Eυ) of the incident photons. Draw the nature of the graph for λ as a function of (Eυ).

Solution
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Since work function is neglected, hence all the energy imparted by photons to electrons comes as kinetic energy. Let the kinetic energy of electrons be
K=12mv2=Eorv=2Emormv=2EmThus,λ=hmv=h2Em
236627_260887_ans.PNG

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