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CAIE A-Level Physics AS 7.3.2 The Expression F F Sv V Vs for the Observed Frequency When a Source Questions

Apply the Doppler-effect expression f₀ = fₛv/(v ± vₛ) to calculate observed frequency for a moving source.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Apply the Doppler-effect expression f₀ = fₛv/(v ± vₛ) to calculate observed frequency for a moving source.

CAIE A-Level Physics AS 7.3.2 The Expression F F Sv V Vs for the Observed Frequency When a Source Questions question 1

[Maximum number: 1]

The siren of a moving police car emits a sound wave with a frequency of 440 Hz . A stationary observer hears sound of frequency 494 Hz . The speed of sound in the air is 340 ms−1340 \mathrm{~ms}^{-1}.

What could be the speed and the direction of movement of the car?

A

37 m s−137 \mathrm{~m} \mathrm{~s}^{-1} directly away from the observer

B

37 m s−137 \mathrm{~m} \mathrm{~s}^{-1} directly towards the observer

C

42 m s−142 \mathrm{~m} \mathrm{~s}^{-1} directly away from the observer

D

42 m s−142 \mathrm{~m} \mathrm{~s}^{-1} directly towards the observer

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