To understand the terms in the Doppler shift formula. The Doppler shift formula

Question

To understand the terms in the Doppler shift formula. The Doppler shift formula gives the frequency f_L at which a listener L hears the sound emitted by a source S at frequency f_s: f_L = f_S upsilon + upsilon_L/upsilon + upsilon_S, where upsilon is the speed of sound in the medium, upsilon_L is the velocity of the listener, and upsilon_S is the velocity of source. The velocity of the source is positive if the source is ___ . Note that this equation may not use the sign convention you are accustomed to. Think about the physical situation before answering. traveling in the +x direction traveling toward the listener traveling away from the listener

Explanation / Answer

when the observer is approaching the stationary source and source moving away from it. then we use above doppler experession

fL = fs (v+vL)/(v+vs)

so the velocity of the source is positive if the source is travelling away from the listener

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