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Calculating velocity of an approaching vehicle

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Is it possible to design a device that calculates the velocity of an approaching vehicle if the speed of sound in air at that location  is known?


Asked Vibhava




Now the source is moving at the speed of sound...


Such a device is already in use. It is based on a phenomenon called Doppler Effect.


Get the details at the following Links.


  1. www.physicsclassroom.com/class/waves/u10l3d.cfm
  2. science.howstuffworks.com/science-vs-myth/everyday-myths/doppler-effect3.htm
  3. http://en.wikipedia.org/wiki/Doppler_effect



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