question_answer 52)

   (i) In the explanation of photo electric effect, we assume one photon of frequency v collides with an electron and transfers its energy. This leads to the equation for the maximum energy of the emitted electron as          where g is the work function of the metal. If an electron absorbs 2 photons (each of frequency v ) 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?

Answer:

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