9702/42/O/N/23
8 (a) State what is meant by a photon.
(b) When the surface of a metal plate is illuminated with electromagnetic radiation, electrons are sometimes emitted from the metal.
(i) State the name of this phenomenon.
(ii) It is observed that this phenomenon occurs only when the frequency of the electromagnetic radiation is greater than a certain minimum value, regardless of the intensity of the radiation.
Explain how this observation provides evidence for the existence of photons.
(c) Fig. 8.1 shows the variation of the maximum kinetic energy of the emitted electrons in (b) with the frequency of the incident radiation.
State the name of the quantity represented by:
(i) the gradient of the line in Fig. 8.1
(ii) the y-intercept of the extrapolated line in Fig. 8.1.
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