What is the Doppler Effect of a Car's Music at Different Positions?

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SUMMARY

The discussion focuses on the Doppler Effect as it applies to a car moving at 25 m/s with a radio playing music at 1800 Hz. For an observer in front of the car, the frequency heard is 1938.5 Hz, while for an observer behind the car, the frequency drops to 1680 Hz. The calculations utilize the Doppler Effect formula, confirming the changes in frequency based on the relative motion of the source and the observer. The speed of sound is assumed to be 350 m/s in this scenario.

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  • Concept of relative motion in physics
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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:
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That looks fine for sound traveling at 350m/s.
 

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