Doppler Effect
Reference from the original Physics I textbook.
- Doppler Effect
The Doppler effect is the change in observed wave frequency caused by motion of the source or detector relative to the propagation medium.
- Related Glossary Terms
- Index
Reviewed physics notes (1)
These corrections keep the original lesson’s purpose while fixing errors in the source edition.
- The change is in frequency, not simply sound level. — Reference 1
Glossary and deeper reading · 1 refreshers
These editorial refreshers supplement the reading. Definitions and examples are added guidance; original source wording and recorded answers remain in their original context.
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Doppler effect
The Doppler effect is a difference between emitted and observed frequency caused by relative motion of source and observer. For sound, both motions must be considered relative to the medium; motion changes the rate at which wavefronts are encountered. For example, a sound source approaching a stationary listener usually produces a higher observed frequency than the source’s rest frequency.