# (i) In the explanation of photo electric effect, we asssume one photon of frequency ν collides with an electron and transfers its energy.

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(i) In the explanation of photo electric effect, we asssume one photon of frequency ν collides with an electron and transfers its energy. This leads to the equation for the maximum energy Emax of the emitted electron as

Emax = hν – φ0

where φ0 is the work function of the metal. If an electron absorbs 2 photons (each of frequency ν ) what will be the maximum energy for the emitted electron?

(ii) Why is this fact (two photon absorption) not taken into consideration in our discussion of the stopping potential?

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(i) Emax = 2hv – ϕ

(ii) The probability of absorbing 2 photons by the same electron is very low. Hence such emissions will be negligible.
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