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2 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2009 · Paper 2 · Question 3(b)(iii)c)

Experimental data for photoemission from calcium across various stopping potentials and wavelengths.

From your plotted graph, determine the work function of the metal.

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Other parts of this question

  1. 3(a)(i)Einstein's photoelectric equation is given by K_max = h*f - phi. Clearly explain each term used in this equation.[3 marks]
  2. 3(a)(ii)Sketch a labelled graph of photocurrent versus applied voltage for two light intensities I1 and I2 (where I2 > I1), clearly marking the stopping potential.[2 marks]
  3. 3(b)(i)Complete the table by calculating and filling in the values of frequency f corresponding to each wavelength.[1 mark]
  4. 3(b)(ii)Plot a graph of stopping potential Vs versus frequency f on the grid provided and draw the best straight line through the points.[3 marks]
  5. 3(b)(iii)a)From your plotted graph, determine Planck's constant.[3 marks]
  6. 3(b)(iii)b)From your plotted graph, determine the threshold frequency.[1 mark]

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