Physics (AS & A Level) · May / June 2022 · Paper 11 · Question 22

The graph shows the variation of the displacement of an air particle with time as a sound wave passes through air. The intensity of the sound is halved while the frequency remains constant. The four graphs below are drawn to the same scale as the graph above. Which graph shows the displacement of the air particle?

1. Adisplacement-time graph with four cycles, same amplitude as original
2. Bdisplacement-time graph with one cycle, larger amplitude
3. Cdisplacement-time graph with two cycles, smaller amplitude
4. Ddisplacement-time graph with two cycles, same amplitude as original

As printed in the paper