2 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2013 · Paper 2 · Question 3(b)

Identify the property of a light source that would make it suitable for a demonstration of this phenomenon and give a reason why this property makes it suitable.

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3(a)Describe the phenomenon of 'photoelectric emission'.[3 marks]
3(c)Calculate the energy (in eV) of a light photon of wavelength 200 nm.[3 marks]
3(d)Calculate the maximum velocity of the electrons ejected from the surface.[3 marks]
3(e)(i)On the grid provided, plot a graph of V_s against λ. Ensure that the λ scale extends to 550 nm.[3 marks]
3(e)(ii)From the graph determine the cut-off wavelength for Caesium.[1 mark]

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