2.3 Sound - Doppler Effect

# 2.3 Sound - Doppler Effect - Doppler Effect 2.3 Sound...

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1 2.3 Sound Doppler Effect. Shock Waves Doppler Effect Doppler effect- the shift in frequency of a wave where the source and observer are moving relative to one another. Two different cases for sound: Observer moving – source stationary Source moving- observer stationary. Observer moving toward a Stationary source (Relative Velocity Increases) s o s o f v v f f = + = λ o o s vv f •Relative velocity of wave (v o + v ) increases. •Frequency increases V = speed of sound V o =speed of observer + == + oo ss v f( 1 ) f Observer moving away from a stationary source (Relative velocity decreases) = λ o o s f V o Relative velocity of wave (v-v o ) decreases. Frequency decreases. v f Source moving toward a stationary observer (wavelength in the medium decreases) •When the source is moving the wavelength of the wave in the media is changed • source approaches observer A •Wavelength decreases and frequency heard by observer A increases • Source moves away from observer B. •Wavelength increases and frequency heard by observer B decreases . v Source Moving Toward observer A •Wavelength decreases o s s f vT vT vT λ− os s v ff = Moving Source Observer λ=λ − •Frequency increases Distance traveled by source in one period

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2 Source Moving Away from observer B •Wavelength
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## This note was uploaded on 06/01/2009 for the course PHYS phys2c taught by Professor Okamura during the Spring '09 term at UCSD.

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2.3 Sound - Doppler Effect - Doppler Effect 2.3 Sound...

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