Doppler effect changes frequency of sound waves from "summary" of Fundamentals of Physics, Volume 1 (Chapters 1 - 20) by David Halliday,Robert Resnick,Jearl Walker
The Doppler effect is a phenomenon that occurs when there is relative motion between a source of sound waves and an observer. When the source is moving toward the observer, the frequency of the sound waves appears to be higher than when the source is stationary. This is because as the source moves closer to the observer, the sound waves are compressed, causing the frequency to increase. Conversely, when the source is moving away from the observer, the frequency of the sound waves appears to be lower than when the source is stationary. This is because as the source moves away from the observer, the sound waves are stretched out, causing the frequency to decrease. The change in frequency is dependent on the speed of the source and the speed of sound in the medium t...
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