Law of photoelectric emission

1.   For a given metal and frequency of incident light the no. of photoelectron ejected per second is directly proportional to the intensity of incident light.

2.   For a given metal there exist a minimum frequency of incident light below which no emission of photoelectron take place called as threshold frequency.

3.   The photoelectric emission is an instantaneous process.

4.   The maximum K.E is independent of the intensity of incident light.
Einstein photoelectric equation

Acc. To Einstein when photon of energy fall on the metal surface the energy of the photon is absorbed by the free electron in a metal.

Critical frequency

It is defined as the highest frequency which when sent straight toward ionosphere get reflected from the ionosphere and return to the earth.

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questions or other competitive exam

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