Doppler - Whenever source / listener approaches the other,...

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Liu UCD Phy9B 07 13 16-8. The Doppler Effect
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Liu UCD Phy9B 07 14 Wave Fronts Wave fronts Top View Point Source 2-D 3-D
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Liu UCD Phy9B 07 15 S L S L S L L L f v v f v v v f v v v v v f ) 1 ( / + = + = + = + = λ Speed of sound: v Speed of moving listener towards source: v L Speed of sound relative to listener: v+v L Source frequency: f S Sound frequency received by listener: Moving towards source, + v L, f L >f S away, - v L, f L <f S
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Liu UCD Phy9B 07 16 Approaching Source & Stationary Listener S S S S f v v T v vT T v = = = λ λ ' S S S S L f v v v f v v v v f = = = / ) ( ' Frequency received by a stationary listener Approaching Source Listener
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Liu UCD Phy9B 07 17 Receding Source S S S S f v v T v vT T v + = + = + = λ λ ' S S S S L f v v v f v v v v f + = + = = / ) ( ' Frequency received by a stationary listener λ Listener
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Liu UCD Phy9B 07 18 S S L S S L L L f v v v v f v v v v v v f + + = + + = + = / ) ( ' λ Signs:
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Unformatted text preview: Whenever source / listener approaches the other, f L >f S Approaching source,-v S Approaching listener, + v L Whenever source / listener recedes from each other, f L <f S Receding source, + v S Receding listener, -v L Liu UCD Phy9B 07 19 Doppler Effect for Electromagnetic Wave S R f v c v c f + = v positive: f R <f S , source is moving away from receiver v negative: f R >f S , source is approaching receiver Taking into account relativistic effects Liu UCD Phy9B 07 20 16-9. Shock Waves & Sonic Boom Mach number v obj /v snd >1 for supersonic speeds Credit: Ensign John Gay USS Constellation, US Navy...
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This note was uploaded on 02/17/2009 for the course PHY na taught by Professor Richardscalettar during the Spring '09 term at UC Davis.

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Doppler - Whenever source / listener approaches the other,...

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