Describe two phenomena associated with the photoelectric effect that cannot be explained using a wave theory of light.
Describe Say what happens, in order. Reasons are not required unless the question also asks why.
Your answer
Suggested time: 3 min
Showing every subjectChange subjects
9702/04/SP/22 · question 1 of 1 in this topic
Question 8
The maximum energy E_max of electrons emitted from a metal surface when illuminated by light of wavelength λ is given by the expression E_max = hc(1/λ − 1/λ₀), where h is the Planck constant and c is the speed of light.
Identify the symbol λ₀.
Identify Name it and, where the marks allow, say what led you there.
Your answer
Suggested time: 2 min
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 variation with 1/λ of E_max for the metal surface is shown in Fig. 8.1.
Use Fig. 8.1 to determine the magnitude of λ₀.
Using You must use the thing it names. An answer that reaches the right value another way may not score.
Your answer
Suggested time: 2 min
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.
Show The result is given, so every step of the reasoning is what earns the marks.
Your answer
Suggested time: 5 min
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.
Your answer
Suggested time: 3 min
9702/04/SP/22Cambridge International AS & A Level Physics 9702 · Specimen 2022 · Paper 4 · sit the whole paper