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Questions on the Photoelectric Effect

Q1.

(a) One quantity in the photoelectric equation is a characteristic property of the metal that emits photoelectrons. Name and define this quantity.

(2 marks)

(b) A metal is illuminated with monochromatic light. Explain why the kinetic energy of the photoelectrons emitted has a range of values up to a certain maximum.

(3 marks)

(c) A gold surface is illuminated with monochromatic ultraviolet light of frequency 1.8 × 1015 Hz. The maximum kinetic energy of the emitted photoelectrons is 4.2 × 10–19 J. Calculate, for gold:

(i) the work function, in J,

(ii) the threshold frequency.

(5 marks)

(Total 10 marks)