Question

in the photoelectric effect there is a cutoff frequency how does the photon picture explain this fact??​

Answer 1

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according to photon picture the photoelectric effect is due to the interaction between a photo and a free electron in the metal .

The free electron will be imitated only if it has sufficient energy equal to the work functions of metal this energy is supplied by the photon.

if the frequency of photon is less than cutoff frequency then no photoelectric emission take place .

so cutoff frequency is = fhai not / h

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Answer 2

Hello!

Not every electromagnetic wave will cause the photoelectric effect, only radiation of a certain frequency or higher will cause the effect. The minimum frequency needed is called the "cutoff frequency" or "threshold frequency'.

Thanks!