Physics (AS & A Level) · May / June 2023 · Paper 13 · Question 25

The diagram shows a string stretched between fixed points X and Y. There is a stationary wave on the string. The solid curve shows the string at a position of maximum displacement at time t0. The dashed curve shows the other position of maximum displacement. The straight central dashed line shows the mean position of the string. Point S on the string is directly above point P. Point T on the string is directly below point Q. Which statement is correct?

1. AA short time after t0, point R on the string will be displaced.
2. BA short time after t0, points S and T on the string move in opposite directions.
3. CThe distance between P and Q is one wavelength.
4. DTwo moving points on the string that are equal distances from point R vibrate in phase.

As printed in the paper