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2 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · May/June 2023 · Paper 2 · Question 3(d)(i)

Figure 9 shows a graph of electron photocurrent, I_p, variation with anode-cathode voltage, V, for a specific level of UV illumination of the cathode.

For EACH of the labelled regions on the graph in Figure 9, state what happens to the flow of the photocurrent and explain why this happens in EACH case. Region A

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Other parts of this question

  1. 3(a)(i)Define EACH of the following terms. Work function[2 marks]
  2. 3(a)(ii)Threshold frequency[1 mark]
  3. 3(a)(iii)Cut-off wavelength[1 mark]
  4. 3(b)With reference to the apparatus in Figure 7, explain the meaning of the term 'stopping potential'.[4 marks]
  5. 3(c)(i)Write the general form of the photoelectric equation and rearrange it to show the linear relationship between stopping potential, V_s, and frequency, f, as…[2 marks]
  6. 3(c)(ii)Determine the gradient of the line in Figure 8.[3 marks]
  7. 3(c)(iii)Determine the percentage difference between the experimental value of h/e obtained in (c) (ii) and the calculated theoretical value of h/e (using the standard…[3 marks]
  8. 3(c)(iv)Comment on the result obtained in (c) (iii).[2 marks]
  9. 3(c)(v)Extrapolate the line on the graph in Figure 8 on page 19, to find the intercept on the V_s axis and use this value to determine the work function of the…[5 marks]
  10. 3(d)(ii)Region B[2 marks]
  11. 3(d)(iii)Region C[3 marks]

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