Physics 9702 · AS & A Level · Errors and uncertainties

Errors and uncertainties — practice question

A double-slit interference experiment is performed to find the wavelength of light from a monochromatic source. The measurements below are given: slit separation $a = 0.50 \pm 0.02\,\text{mm}$ fringe separation $x = 1.7 \pm 0.1\,\text{mm}$ distance between slits and screen $D = 2.000 \pm 0.002\,\text{m}$ What percentage uncertainty is there in the wavelength that is calculated?

  • A0.1%
  • B1%
  • C6%
  • D10%

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