Example photoelectric questions:
(a) Describe a simple experiment by which the photoelectric effect may be
(b) Explain what is meant by
(i) a photon,
(ii) work function.
How do these two concepts explain that:
(iii) the number of electrons emitted is proportional to the intensity of
the radiation incident upon a clean metal surface,
(iv) these electrons are emitted with a range of velocities from zero up
to a maximum value which increases with the frequency of the incident radiation
but is independent of the intensity,
(v) there is, for each metal, a certain minimum frequency below which no emission occurs.
(c) Give a brief description of a use
to which the photoelectric effect is put.
(AEB, question B16, paper 3, June 1982)
2. (a) Explain the term "wave / particle duality"
(b) (i) Discuss the experimental evidence that suggests that electromagnetic radiation is quantized.
(ii) A beam of electrons has a speed equal to 5x106 ms-1. Use de Broglie's duality expression to suggest a possible way in which the wave properties of the electron could be demonstrated. (Take the mass of the electron as 9.0 x 10-31 kg