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What is Doppler effect? Write any two ap...

What is Doppler effect? Write any two applications of it.

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Uses of Doppler effect
1. Doppler effect of sound waves is used in determining the speed of the approaching or receding vehicles.
2. Doppler effect of light waves helps us in determining whether a star or a galaxy is approaching or receding the earth.
3. Doppler effect is used in determining the size of foreign objects in the body.
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