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5 marksProperties of Waves

CAPE Physics Unit 1 · 2012 · Paper 2 · Question 5(b)

A diffraction grating having 4.55 × 10⁵ lines per metre is used to examine the light from a glowing gas. The first order violet light emerges at an angle of 11.8° and the first order red light at an angle of 15.8°.

Calculate the wavelengths of the two colours.

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Other parts of this question

  1. 5(a)(i)Differentiate between the terms 'diffraction' and 'refraction'.[6 marks]
  2. 5(a)(ii)Describe how the width of the aperture through which a wave is passing affects the diffraction of the wave.[1 mark]
  3. 5(a)(iii)Explain how a diffraction grating produces a spectrum.[1 mark]
  4. 5(c)With the aid of calculations, determine what would be observed at an angle of 54.8°.[4 marks]

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