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Question

Two metals A and B have work function 4 electron volts and 10 electron volts respectively, Which metal has higher threshold wavelength?

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Solution

consider a particle of mass 'm' rotating about a
We know,
E=hc=hcλ
Thus, λ or threshold wavelength is inversely proportional to the energy or the work-function.
So the metal A will have a higher threshold wavelength as its work-function is less compared to that of metal B.

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