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Doppler Effect of a car

  • #1

Homework Statement


A car is driving down the road at 25m/s. Inside the car, the radio is blaring music at 1800Hz. How would it sound to a person standing still a) in front of the car b) behind the car?


Homework Equations


[fo/(vw+vo)] = [fs/(vw-vs)]


The Attempt at a Solution


a)
[fo/(vw+vo)] = [fs/(vw-vs)]
= [fo/350] = [1800/(350-25)]
= fo = 1938.5Hz

b)
[fo/(vw+vo)] = [fs/(vw-vs)]
= [fo/350] = [1800/(350+25)]
= fo = 1680Hz
 
Last edited:

Answers and Replies

  • #2
Kurdt
Staff Emeritus
Science Advisor
Gold Member
4,812
6


That looks fine for sound travelling at 350m/s.
 

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