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Questions on the Photoelectric Effect

Q2.

The graph shows how the maximum kinetic energy of electrons emitted from the cathode of a photoelectric cell varies with the frequency of the incident radiation.

(a) Calculate the maximum wavelength of electromagnetic radiation that can release
photoelectrons from the cathode surface.

(3 marks)

(b) Another photoelectric cell uses a different metal for the photocathode. This
metal requires twice the minimum energy for electron release compared to the
metal in the first cell.

(i) If drawn on the same axes, how would the graph line obtained for this second
cell compare with the one for the fi rst cell?

(ii) Explain your answer with reference to the Einstein photoelectric equation.

(3 marks)

(Total 6 marks)