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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

 

Answer:

 

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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