22.1e Ex2 ON11 P43 Q7 Inverse Wavelength Graph | A2 Quantum Physics | Cambridge A Level Physics
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Example 2 - 9702/43/O/N/11: An explanation of the photoelectric effect includes the terms photon energy and work function energy. (a) Explain what is meant by (i) a photon, (ii) work function energy.
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(b) In an experiment to investigate the photoelectric effect, a student measures the wavelength λ of the light incident on a metal surface and the maximum kinetic energy Emax of the emitted electrons. The variation with Emax of 1/λ is shown in Fig. 7.1. #A2photoelectricGraphP4
(i) The work function energy of the metal surface is Φ.State an equation, in terms of λ, Φ and Emax, to represent conservation of energy for the photoelectric effect. Explain any other symbols you use.
(ii) Use your answer in (i) and Fig. 7.1 to determine 1. the work function energy Φ of the metal surface, 2 a value for the Planck constant.
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