May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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24Sound Doppler EffectMedium1 mark
The siren on an emergency vehicle emits a sound of constant frequency 1100 Hz. The driver in a stationary car hears the sound at a frequency of 1000 Hz. The speed of sound in air is 340 m s. What is the velocity of the emergency vehicle?