Answer to Question #2876 in Acoustics for Rooky
f = v/(v + vs) f0
where vs is positive if the source is moving away from the observer, and negative if the source is moving towards the observer.
In this case v is the speed of sound ( approximately 343 m/s)
So f=(v/(v+vs )) f0
f = (343/(343-50))*1500 ≈ 1755.97 Hz
Answer : f ≈ 1755.97 Hz
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