A-LevelPhysicsQuantum physics9702/42 · Oct/Nov 2017 · Q105 Marks
A metal surface is illuminated with light of a single wavelength λ. On Fig. 10.1, sketch the variation with λ of the maximum kinetic energy EMAX of the electrons emitted from the surface. On your graph mark, with the symbol λ₀, the threshold wavelength. [Figure 10.1]
- (a)A metal surface is illuminated with light of a single wavelength λ. On Fig. 10.1, sketch the variation with λ of the maximum kinetic energy EMAX of the electrons emitted from the surface. On your graph mark, with the symbol λ₀, the threshold wavelength. [Figure 10.1][3]
- (b)A neutron is moving in a straight line with momentum p. The de Broglie wavelength associated with this neutron is λ. On Fig. 10.2, sketch the variation with momentum p of the de Broglie wavelength λ. [Figure 10.2][2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [1] (a) λ₀ marked and graph line passing through EMAX = 0 at λ = λ₀
- [1] (a) graph line with λ always < λ₀
- [1] (a) negative gradient with correct concave curvature
- [1] (b) curve with negative gradient and correct concave curvature
- [1] (b) not touching either axis
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