May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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24Sound Doppler EffectMedium1 mark
A train is travelling with a constant velocity.
It operates its whistle as it moves directly towards a student.
The whistle emits a continuous sound of constant frequency.
Which graph shows the variation with time of the frequency of the sound heard by the student?
four graphs of frequency f against time t: A a curve starting high and falling with increasing steepness; B a straight line starting high and falling steadily; C a horizontal line; D a straight line starting low and rising steadily