Physics (AS & A Level) · Oct / Nov 2019 · Paper 11 · Question 26

Two wave pulses are travelling towards each other on a long rope. The pulses have the same amplitude and wavelength and are travelling at a speed of 0.50 m s–1. The diagram shows the rope at time t = 0. [diagram showing two wave pulses on a rope with distance axis from 4.0 m to 8.0 m, left pulse travelling right at 0.50 m s–1, right pulse travelling left at 0.50 m s–1] Which diagram shows the rope at time t = 3.0 s?

1. A[diagram A: two separate pulses on distance axis 5.0 m to 7.5 m]
2. B[diagram B: overlapping pulses forming a large central displacement on distance axis 5.0 m to 7.5 m]
3. C[diagram C: two overlapping pulses on distance axis 5.0 m to 7.5 m]
4. D[diagram D: flat rope on distance axis 5.0 m to 7.5 m]

As printed in the paper