A truckmoving at 240 mi/hr passes a police car moving 100 mi/hr headed in theopp

Question

A truckmoving at 240 mi/hr passes a police car moving 100 mi/hr headed in theopposite direction. If the frequency of the siren is 500 Hzrelative to the police car, what is the frequency heard by anobserver in the truck after the police car passes the truck? (Thespeed of sound in air is 343 m/s.) Answer in units ofHz. 1) 385.294 2) 304.019 3) 338.604 4) 389.905 5) 332.84 6) 373.189 7) 367.425 8) 309.784 9) 403.163 10)350.133 A truckmoving at 240 mi/hr passes a police car moving 100 mi/hr headed in theopposite direction. If the frequency of the siren is 500 Hzrelative to the police car, what is the frequency heard by anobserver in the truck after the police car passes the truck? (Thespeed of sound in air is 343 m/s.) Answer in units ofHz. 1) 385.294 2) 304.019 3) 338.604 4) 389.905 5) 332.84 6) 373.189 7) 367.425 8) 309.784 9) 403.163 10)350.133 1) 385.294 2) 304.019 3) 338.604 4) 389.905 5) 332.84 6) 373.189 7) 367.425 8) 309.784 9) 403.163 10)350.133

Explanation / Answer

the frequency heard by an observer in the truck after thepolice car passes the truck is f' = (v + vo/v - vs) * f v = 343 m/s,vo= 240 mi/hr,vs= 100 mi/hrand f = 500 Hz

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