A stationary detector measures the frequency of a sound source that first moves at constant velocity directly toward the detector and then (after passing the detector) directly away from it.

Question

anonymous · Answer

A stationary detector measures the frequency of a sound source that first moves at constant velocity directly toward the detector and then (after passing the detector) directly away from it. The emitted frequency is f. During the approach the detected frequency is f'app and during the recession it is f'rec. If ( f'app - f'rec)/f = 0.741, what is the ratio vs /v of the speed of the source to the speed of sound?

anonymous · Answer

I have NO IDEA how to relate the ratios.

anonymous · Answer

Like I need a  way to get started. Some sort of a clue.

anonymous · Answer

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/dopp.html#c1

amriju · Answer

do u know doppler effect in sound waves..?

amriju · Answer

doppler effect will relate the vel of source, sound to apparent and accual frequencies...two eqns one while the source approches..and the other when its moving away...are going to be formd...determine the ratio from there...

anonymous · Answer

Yeah I know doppler effect...

amriju · Answer

so....is my process reaching anywhere..?

anonymous · Answer

No...

anonymous · Answer

Let me try again.

amriju · Answer

:(

anonymous · Answer

So:

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