question_answer

Work function of aluminium is\[\mathbf{4}.\mathbf{2}\text{ }\mathbf{eV}\]. If two photons each of energy \[\mathbf{2}.\mathbf{5}\text{ }\mathbf{eV}\] are incident on its surface, will the emission of electrons take place? Justify your answer.

Answer:

                No. Energy of a single photon must be greater than the work of the metal for the emission of a photoelectron.