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1 markParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2008 (T&T) · Paper 2 · Question 3(a)(i)

Photoelectric effect experimental arrangement with evacuated quartz tube and photoelectric equation hf - (1/2)m_e v^2 = \phi.

Explain what is meant by the 'stopping potential'.

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Other parts of this question

  1. 3(a)(ii)With reference to Figure 4, explain how the stopping potential may be measured.[2 marks]
  2. 3(b)(i)Complete Table 2 by filling in the missing values of 1/\lambda.[1 mark]
  3. 3(b)(ii)On the grid provided, plot a graph of stopping potential, V_s against 1/\lambda.[3 marks]
  4. 3(b)(iii)a)Use the graph to determine Planck's constant.[4 marks]
  5. 3(b)(iii)b)Use the graph to determine the cut-off wavelength, \lambda_0.[2 marks]
  6. 3(b)(iii)c)Use the graph to determine the work function of the metal.[2 marks]

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