February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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25Standing WavesHard1 mark
A wave on a stretched string causes the particles on the string to vibrate. The diagram shows part of the string at one instant.
snapshot of a wave on a stretched string at one instant, showing one crest and the following trough; particles P and Q are both on the crest close together, with Q slightly further down its slope than P, and particle R is at the bottom of the trough that follows
P, Q and R are particles on the string. Which statement about two of the particles and the wave is correct?