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5 marksProperties of Waves

CAPE Physics Unit 1 · 2011 · Paper 2 · Question 5(b)(ii)

Light from glowing hydrogen contains two discrete spectral lines at 656.3 nm and 486.1 nm. These lines are viewed through a spectrometer using a diffraction grating with 6000 slits per cm. The spectra is viewed in the second order (n = 2).

Calculate the angular positions of the two spectral lines.

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Other parts of this question

  1. 5(a)(i)Distinguish clearly between 'refraction' and 'diffraction' of light. Draw ray diagrams, ONE in EACH case, to illustrate EACH phenomenon.[4 marks]
  2. 5(a)(ii)Discuss how interference and diffraction contribute to the action of a diffraction grating.[3 marks]
  3. 5(b)(i)Calculate the slit spacing of the diffraction grating, expressed in metres.[2 marks]
  4. 5(b)(iii)Calculate the angular separation between the two spectral lines.[1 mark]

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