Question
What frequency would a listener hear if a train moves away from the listener at 180 km/hr? The frequency of the horn is 3500 Hz, and the air temperature is 19.0 degrees Celsius. Show work, and include 3 significant figures.
Answers
Henry
Vt = 180km/h = 180,000m/3600s = 50 m/s. = Velocity of the train.
Vs = 332 + 0.6T = 332 + 0.6*19 = 343 m/s = Velocity of sound.
Fr = ((Vs-Vr)/(Vs+Vt)) * Fh.
Fr = ((343-0)/(343+50)) * 3500 =
Fr = Frequency heard by the receiver(listener).
Vs = 332 + 0.6T = 332 + 0.6*19 = 343 m/s = Velocity of sound.
Fr = ((Vs-Vr)/(Vs+Vt)) * Fh.
Fr = ((343-0)/(343+50)) * 3500 =
Fr = Frequency heard by the receiver(listener).