Physics (AS & A Level) · Oct / Nov 2017 · Paper 11 · Question 29

A bar vibrates with frequency f to produce water waves in a ripple tank. The waves pass through a gap of width x in a barrier so that diffraction occurs. Which combination of vibration frequency and gap width will produce the smallest angle of diffraction?

1. Avibration frequency f/2, gap width x/2
2. Bvibration frequency f/2, gap width 2x
3. Cvibration frequency 2f, gap width x/2
4. Dvibration frequency 2f, gap width 2x

As printed in the paper