Asked by Tommy
Hello to all the fantastic tutors! I'm stuck on this question, I was wondering if there is a way to solve this.
A car horn emits 378Hz sound. If the car moves at 23m/s with its horn blasting, what frequency will a person standing in front of the car hear?
What I've done:
f=378Hz
v=23m/s
wavelength: v/f = 23/378 = 0.061m
(not too sure what to do next)
Thank you so much in advance!
A car horn emits 378Hz sound. If the car moves at 23m/s with its horn blasting, what frequency will a person standing in front of the car hear?
What I've done:
f=378Hz
v=23m/s
wavelength: v/f = 23/378 = 0.061m
(not too sure what to do next)
Thank you so much in advance!
Answers
Answered by
Henry
Fp = ((Vs+Vp)/(Vs-Vh))*Fh
Fp = ((343+0)/(343-23)*378 = 405.2 Hz.
Fp = Freq. heard by the person.
Vp = Velocity of the person.
Vs = Velocity of sound in air.
Vh = Velocity of the horn.
Fh = Freq. of the horn.
Fp = ((343+0)/(343-23)*378 = 405.2 Hz.
Fp = Freq. heard by the person.
Vp = Velocity of the person.
Vs = Velocity of sound in air.
Vh = Velocity of the horn.
Fh = Freq. of the horn.
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