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The maximum energy E_max of electrons emitted from a metal surface illuminated by light of wavelength λ is E_max = hc(1/λ − 1/λ₀).
The metal surface becomes oxidised. Photoelectric emission is still observed but the work function energy is increased.
On Fig. 8.1, draw a line to show the variation with 1/λ of E_max for the oxidised surface.
9702/04/SP/22Cambridge International AS & A Level Physics 9702 · Specimen 2022 · Paper 4 · Question 8(c)
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Suggested time: 3 min