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8(b)(iii)3 marks

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).

Use the gradient of Fig. 8.1 to determine a value for the Planck constant h. Show your working.

9702/04/SP/22Cambridge International AS & A Level Physics 9702 · Specimen 2022 · Paper 4 · Question 8(b)(iii)

Fig. 8.1 — see the question text for what it shows

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Suggested time: 5 min