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3 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2003 · Paper 1 · Question 8(ii)a)

A second slab of material, of thickness x_2 and absorption coefficient mu_2, is placed alongside the first slab as shown in Figure 8 b.

Show that the Intensity, I, is given by I = I_0 e^{-(mu_1 x_1 + mu_2 x_2)}.

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Other parts of this question

  1. 8(a)(i)Explain the principle by which a continuous X-ray spectrum is produced.[2 marks]
  2. 8(a)(ii)Why is a vacancy in an inner electron shell usually required for an atom to emit an X-ray photon?[2 marks]
  3. 8(b)(i)Write an expression for the emerging intensity, I, in terms of I_0, mu_1 and x_1.[1 mark]
  4. 8(ii)b)Calculate the value of I where I_0 = 500 W m^-2, mu_1 = 8.0 m^-1, x_1 = 2.0 mm, mu_2 = 4.0 m^-1, x_2 = 4.0 mm.[2 marks]

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