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2 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2005 · Paper 2 · Question 8(c)(i)

Light of intensity 1.5 x 10^-2 W m^-2 and wavelength 250 x 10^-9 m is incident on an iron surface of area 1 x 10^-4 m^2 that reflects 95% of light. Iron has a threshold frequency of 1.1 x 10^15 Hz.

Calculate the intensity of light available for the photoelectric effect.

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Other parts of this question

  1. 8(a)(i)Define the terms: 'work function', 'threshold frequency', and 'stopping potential' as applied in describing the photoelectric effect.[3 marks]
  2. 8(a)(ii)What property of light does the photoelectric effect display?[1 mark]
  3. 8(b)(i)What conclusions can be drawn from this plot?[2 marks]
  4. 8(b)(ii)Explain how the maximum kinetic energy and maximum velocity of the photoelectrons can be deduced from this plot.[2 marks]
  5. 8(c)(ii)Calculate the number of electrons emitted per second.[4 marks]
  6. 8(c)(iii)Calculate the work function in electron volts for iron.[3 marks]
  7. 8(c)(iv)Calculate the stopping potential for this radiation.[3 marks]

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