Physics (AS & A Level) · Oct / Nov 2021 · Paper 11 · Question 21

Two balls float on the surface of the sea. The balls are separated by a distance of 1.30 m. A wave travels on the surface of the sea so that the balls move vertically up and down. The distance between a crest and an adjacent trough of the wave is 0.90 m. What is the phase difference between the two balls?

1. A55°
2. B110°
3. C160°
4. D260°

As printed in the paper