explain Doppler effect in sound. obtain an expression for apparent frequency of sound when source and listeners are (a) approaching each other (b) moving away from each other
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The Doppler Effect frequency equations can be readily determined from the derived general wavelength equation. The resulting general Doppler Effect frequency equation is:
fO/(c − vO) = fS/(c − vS)
From the general equation, the equation for the case when the observer is stationary can be found be setting vO = 0.
fO = fSc/(c − vS)
Δf = −fS vS/(c − vS)
Likewise, the equation when the source is stationary can be found be setting vS = 0.
fO = fS(c − vO)/c
Δf = vOfS/c
The Doppler Effect frequency equations can be readily determined from the derived general wavelength equation. The resulting general Doppler Effect frequency equation is:
fO/(c − vO) = fS/(c − vS)
From the general equation, the equation for the case when the observer is stationary can be found be setting vO = 0.
fO = fSc/(c − vS)
Δf = −fS vS/(c − vS)
Likewise, the equation when the source is stationary can be found be setting vS = 0.
fO = fS(c − vO)/c
Δf = vOfS/c
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