Q: (i) In the explanation of photoelectric effect, we assume one photon of frequency ν collides with an electron and transfers its energy. This leads to the equation for the maximum energy E_{max} of the emitted electron as

E_{max} = h ν – φ_{0} ; where φ_{0} 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 ?