A-LevelPhysicsOscillations9702/12 · May/June 2018 · Q281 Mark
The diagram shows a stationary wave, at time t = 0, that has been set up on a string fixed between points P and S. [Diagram] The nodes of the stationary wave occur on the string at P, Q, R and S. Point X is moving down at time t = 0. The points on the string vibrate with time period T and maximum amplitude 2 cm. The displacement s is positive in the upward direction. Which graph best shows the variation with t of the displacement s of point Y on the string?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AGraph of displacement s vs time t, starting at 0, decreasing to negative maximum at T/4, returning to 0 at T/2, increasing to positive maximum at 3T/4, returning to 0 at T.
BGraph of displacement s vs time t, starting at 0, increasing to positive maximum at T/4, returning to 0 at T/2, decreasing to negative maximum at 3T/4, returning to 0 at T.
CGraph of displacement s vs time t, starting at 0, decreasing to negative maximum at T/2, returning to 0 at T.
DGraph of displacement s vs time t, starting at 0, increasing to positive maximum at T/2, returning to 0 at T.
✓ Correct answer
A: Graph of displacement s vs time t, starting at 0, decreasing to negative maximum at T/4, returning to 0 at T/2, increasing to positive maximum at 3T/4, returning to 0 at T.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Oscillations and see which topics are most likely to come up next.
Sign up free →