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IB Physics HL C 5 2 Doppler Wavefront Diagrams Questions

Read Doppler wavefront diagrams to relate source motion, wavelength spacing and the observed frequency before and after closest approach.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • identify how a moving sound source displaces successive circular wavefront centres and changes spacing in front of and behind the source
  • explain why closer wavefronts produce higher observed frequency and wider wavefronts produce lower observed frequency when wave speed is unchanged
  • use wavefront diagrams and f equals v divided by lambda to predict observed frequency changes as a source approaches or recedes

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Study C.5.2—Doppler wavefront diagrams conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL C 5 2 Doppler Wavefront Diagrams Questions question 1

[Maximum number: 1]

A point source of sound is moving to the right at constant speed. The source emits sound waves of constant frequency. The speed of the source is less than the speed of sound. Which diagram correctly shows the wavefronts of the sound?

A
Figure for Question IB Physics HL C 5 2 Doppler Wavefront Diagrams Questions question 1 — IB Physics HL — Option A
B
Figure for Question IB Physics HL C 5 2 Doppler Wavefront Diagrams Questions question 1 — IB Physics HL — Option B
C
Figure for Question IB Physics HL C 5 2 Doppler Wavefront Diagrams Questions question 1 — IB Physics HL — Option C
D
Figure for Question IB Physics HL C 5 2 Doppler Wavefront Diagrams Questions question 1 — IB Physics HL — Option D
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