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3 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2004 · Paper 2 · Question 3(b)(ii)

Figure 3b shows a graph of stopping potential V against 1/λ.

Use the graph in Figure 3b to determine the cut-off wavelength λ_0.

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Other parts of this question

  1. 3(a)Show that the photoelectric equation hf - Φ = (1/2)m_e v^2 can be written as V = (hc/e)(1/λ) - (hc/e)(1/λ_0), where V is stopping potential, c is speed of…[4 marks]
  2. 3(b)(i)Use the graph in Figure 3b to determine Planck's constant.[3 marks]

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