Lecture 38

Lecture 38 - Last Meeting Physics 231 General University...

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1 Physics 231 General University Physics Lecture 38 Lecture 9 1 Last Meeting ± Sound Waves Lecture 9 2 Today ± Doppler Effect Lecture 9 3 Doppler Effect ± Demo: moving sound generator and receiver Lecture 9 4 The Doppler Effect ± The Doppler effect is the apparent change in frequency (or wavelength) that occurs because of motion of the source or observer of a wave ² When the speed of the wave relative to the observer is higher than the speed of the wave, the frequency appears to increase ² When the speed of the wave relative to the observer is lower than the speed of the wave, the frequency appears to decrease Lecture 9 5 Doppler Effect, Observer Moving ± The observer moves with a speed of v o ± Assume a point source that remains stationary relative to the air ± It is convenient to represent the waves with a series of circular arcs concentric to the source ² These surfaces are called a wave front
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2 Lecture 9 6 Doppler Effect, Observer Moving, (cont.) ± The distance between adjacent wave fronts is the wavelength ± The speed of the sound is v , the frequency is ƒ , and the wavelength is λ ± When the observer moves toward the source, the speed of the waves relative to the observer is v ’ = v + v o ²
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Lecture 38 - Last Meeting Physics 231 General University...

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