Physics (AS & A Level) · Oct / Nov 2017 · Paper 11 · Question 24

Diffraction can be observed when a wave passes an obstruction. The diffraction effect is greatest when the wavelength and the obstruction are similar in size. For waves travelling through air, what is the combination of wave and obstruction that could best demonstrate diffraction?

1. Amicrowaves passing a steel post
2. Bradio waves passing a copper wire
3. Csound waves passing a human hair
4. Dvisible light waves passing a gate post

As printed in the paper