A rude man in a Rudabega (car) holds his hand down on the horn. He blasts a sing

Question

A rude man in a Rudabega (car) holds his hand down on the horn. He blasts a single continuous tone at which his car's 'pitchpipe app' measures at 440 Hz. The Rudebega rude man is stuck in traffic; the car's speedometer says 0 miles/hour (relative to the road). You are 100 yards away. You are also stuck on the road with a speedometer reading 0 (relative to the road). You are aware that sounds travels at 340 m/s relative to air. You are also aware that wind is blowing from Rudebega to you at 40 m/s (relative to the road). You are therefore not surprised to find that the sound you hear registers by your car's equipment to be of frequency higher than 440 HZ.

Explanation / Answer

False.

No Doppler Effect will take place.

Observed Frequency = f0 * (Vsound +/- Vsource)/(Vsound +/- Vobserver)

If observer and source both are at rest, this equation won't change. Even if speed of sound changes, Doppler will not take place. In our case, speed of wind will increase the Vsound. Which will not affect frequency.

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