A police car sounding a siren with a frequency of 1280 Hz is traveling at 140.0k

Question

A police car sounding a siren with a frequency of 1280 Hz is traveling at 140.0km/h .

Part A

What frequencies does an observer standing next to the road hear as the car approaches and as it recedes?

Fapproaching, F receding

Part B

What frequencies are heard in a car traveling at 80.00km/h in the opposite direction before and after passing the police car?

Fbefore, Fafter

Part C

The police car passes a car traveling in the same direction at 90.00km/h . What two frequencies before and after overtaking are heard in this car?

Fbefore,Fafter

Explanation / Answer

A fbefore = 1456 hz fafter= (330/(330+40))*1280 hz= 1140 Hz

B=f before =1553 Hz fafter=(330-22)/(330+40)*1280 Hz = 1065

C= fbefore=1346 Hz fafter =(330+25)/(330+40)*1280=1228 Hz

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