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5 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2001 · Paper 2 · Question 8(c)

If the light is incident on a surface with work function 2.05 eV, state whether electrons will be emitted, and if so, calculate their maximum kinetic energy. (1 eV = 1.6 × 10^(-19) J)

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  1. 8(a)(i)Discuss the physical process described by E_2 - E_1 = hf and state what EACH term represents.[4 marks]
  2. 8(a)(ii)Explain what is meant by 'work function'. State the energy transformation that takes place when light is incident on a surface causing electron emission, and…[4 marks]
  3. 8(b)(i)Determine the energy of each photon emitted.[3 marks]
  4. 8(b)(ii)Determine the number of photons emitted per second.[4 marks]

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