Asked by Anonymous



The security alarm on a parked car goes off and produces a frequency of 1370 Hz. The speed of sound is 343 m/s. As you drive toward this parked car, pass it, and drive away, you observe the frequency to change by 147 Hz. At what speed are you driving?
Answered by bobpursley
use the doppler formula, moving observer.

I am not certain what is meant by the As you drive away...

I suspect the total doppler change 147hz from high to low, meaning the max dopper change was half that on approaching, and half when going away.
Answered by Jack
The security alarm on a parked car goes off and produces a frequency of 1010 Hz. The
speed of sound is 343 m/s. As you drive toward this parked car, pass it, and drive away,
you observe the frequency to change by 83 Hz. At what speed are you driving?
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