The Doppler effect is frequently employed in the medicine. A sound wave is directed towards a blood vessel and the frequency of the reflected wave is analyzed. What can you hypothesize about the flow of blood in an artery is the frequency of the reflected wave is lower than the original frequency of the sound generator?
In medicine, the Doppler Effect can be used to measure the direction and speed of blood flow in arteries and veins.
If the frequency of the reflected wave is lower than the original frequency of the sound generator, then you can hypothesize that the flow of the blood is away from the sound generator
The Doppler equation for this case is
where
are the reflected frequency received, original frequency of the
generator, speed of sound and speed of blood respectively.
Clearly
If you measure the two frequencies then you can even find out the speed of the blood flow.
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