Friday
March 24, 2017

Post a New Question

Posted by on Sunday, December 2, 2012 at 1:51pm.

A person with perfect pitch sits on a bus bench listening to the 444 Hz horn of an approaching car. If the person detects a frequency of 480 Hz, how fast is the car moving?

  • physics - , Tuesday, December 4, 2012 at 7:43pm

    F = ((V+Vr)/(V-Vs))*Fs = 480 Hz.
    ((343+0)/(343-Vs))*444 = 480
    ((343)/(343-Vs))*444 = 480
    152292/(343-Vs) = 480
    Cross multiply:
    164640-480Vs = 152,292
    -480Vs = 152,292-164,640 = -12,348
    Vs = 25.725 m/s.

  • physics - , Tuesday, December 4, 2012 at 7:54pm

    F = Frequency as heard by receiver(man).
    V = Velocity of sound in air.
    Vr = Velocity of the receiver(man).
    Vs = Velocity of source(car).
    Fs = Frequency of source.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question