At the Indianapolis 500, you can measure the speed of cars just by listening to the difference in pitch of the engine noise between approaching and receding cars. Suppose the sound of a certain car drops by a factor of 2.30 as it goes by on the straightaway. How fast is it going? (Take the speed of sound to be 343 m/s.)

Answer in km/h

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  1. Use your doppler formula.

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