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S10P1CLec14B

# S10P1CLec14B - Physics 1C Lecture 14B"I did never know so...

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Physics 1C Lecture 14B "I did never know so full a voice issue from so empty a heart: but the saying is true 'The empty vessel makes the greatest sound'." --William Shakespeare

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Doppler Effect Why does an ambulance siren moving towards you sound different than when it is moving away from you? It is wave property of sound. Let’s say there is a stationary source that is emitting sound at a certain frequency. Observers on either side of the source observe the same frequency ( λ is the same for both). s O1 O2 f = v sound λ
Doppler Effect But what if the source is moving to the left, then: O1 O2 s v s Observer 1 believes that the wavelength has decreased (compared to before): f 1 = v sound λ 1 Observer 2 believes that the wavelength has increased (compared to before): increased decreased f 2 = v sound 2 decreased increased

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Doppler Effect We Fnd that for a source moving: where f o is the frequency the observer detects, f s is the frequency the source emits, v s is the velocity of the source, v sound is the velocity of the sound wave. Use “–” if the source is moving toward the observer and use “+” if the source is moving away from the observer. We can also have the observer moving toward or away from the source.
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S10P1CLec14B - Physics 1C Lecture 14B"I did never know so...

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