Physics · May / June 2016 · Paper 11 · Question 20

A longitudinal wave passes along a spring. The coils of the spring vibrate from side to side. The diagram shows the positions of the coils at one particular time. [diagram of spring coils labelled W, X, Y, Z] Which positions are one wavelength apart?

1. AW and X
2. BW and Z
3. CX and Z
4. DY and Z

As printed in the paper