Physics (AS & A Level) · Oct / Nov 2017 · Paper 11 · Question 5

A double-slit interference experiment is used to determine the wavelength of light from a monochromatic source. The following measurements are used. slit separation a = 0.50 ± 0.02 mm fringe separation x = 1.7 ± 0.1 mm distance between slits and screen D = 2.000 ± 0.002 m What is the percentage uncertainty in the calculated wavelength?

1. A0.1%
2. B1%
3. C6%
4. D10%

As printed in the paper