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3 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2007 · Paper 2 · Question 9(a)

Explain the meaning of 'photoelectric effect' and discuss why the existence of a threshold cut-off frequency provides evidence for the particle model of light over the wave model.

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Other parts of this question

  1. 9(b)(i)Calculate the number of photons incident on the illuminated surface per second.[4 marks]
  2. 9(b)(ii)Calculate the number of photoelectrons emitted per second.[3 marks]
  3. 9(c)(i)Explain how the maximum kinetic energy of the photoelectrons can be determined experimentally.[2 marks]
  4. 9(c)(ii)Write down the photoelectric equation based on the conservation of energy and define each term in the equation.[3 marks]
  5. 9(c)(iii)Use the photoelectric equation to calculate the threshold wavelength for photo-emission from the metal.[3 marks]
  6. 9(c)(iv)State, with a reason, whether photoelectric emission will occur when light of wavelength 680 nm is incident on this metal surface.[2 marks]

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