Physics (AS & A Level) · Feb / March 2019 · Paper 12 · Question 23

The top row of bars represents a set of particles inside the Earth and at rest. The lower row represents the same particles at one instant as a longitudinal wave passes from left to right through the Earth. What should be measured to determine the amplitude of the oscillations of the particles in the lower row as the wave passes?

1. Ahalf the maximum displacement of the particles from their position at rest
2. Bhalf the maximum distance apart of the particles
3. Cthe maximum displacement of the particles from their position at rest
4. Dthe maximum distance apart of the particles

As printed in the paper