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4 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2017 · Paper 2 · Question 3(b)(i)

A plot of stopping potential V_s against frequency f of incident light on an unknown metal is shown in Figure 5.

Determine the slope of the graph in SI units.

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Other parts of this question

  1. 3(a)Identify the parts or quantities indicated by labels P, Q, and R in Figure 4.[3 marks]
  2. 3(b)(ii)Formulate the algebraic equation relating stopping potential V_s to incident frequency f using the graph in Figure 5.[3 marks]
  3. 3(b)(iii)State what the slope of this graph represents physically.[1 mark]
  4. 3(b)(iv)From the graph, determine the threshold wavelength for the unknown metal.[4 marks]

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