Fr = (Vs+Vt)/(Vs-Vc)*Fc =
(443+14)/(443-75) * 1000 = 457/368 * 1000 = 1242 Hz. = Freq.
heard by the receiver(Truck driver).
A police car moving at 75m/s is initially behind a truck moving in the same direction at 14m/s. The natural frequency of the car's siren is 1000Hz.
What is the change in frequency observed by the truck driver as the car overtakes him?
2 answers
Correction: Vs = 343 m/s.
(343+14)/(343-75) * 1000 = 357/268 * 1000 = 1332 Hz.
(343+14)/(343-75) * 1000 = 357/268 * 1000 = 1332 Hz.
2 answers