A-LevelPhysicsQuantum physics9702/42 · May/June 2018 · Q107 Marks
Describe the photoelectric effect.
- (a)Describe the photoelectric effect.[2]
- (b)(i)Data for the work function energy Φ of two metals are shown in Fig. 10.1. Light of wavelength 420 nm is incident on the surface of each of the metals. State what is meant by a photon.[2]
- (b)(ii)Calculate the energy of a photon of the incident light.[2]
- (b)(iii)State whether photoelectric emission will occur from each of the metals. sodium: zinc:[1]
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 (May/June 2018). The mark or mark type is shown in brackets.
- [B1] emission of electron
- [B1] when electromagnetic radiation incident (on surface)
- [M1] packet/quantum/discrete amount of energy
- [A1] of electromagnetic radiation
- [C1] E = hc/λ
- [A1] = (6.63 × 10⁻³⁴ x 3.00 × 10⁸) / (420 × 10⁻⁹) = 4.7 x 10⁻¹⁹ J
- [B1] sodium: yes zinc: no
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