PHYSICS OF DOPPLER US

DOPPLER EFFECT:



When the receiver is stationary the frequency of sound emitted (Fo) and that reflected(Fr) from the receiver are the same.
When the receiver of the sound is moving the frequency of emitted sound (from the source) shows change. If the receiver is moving towards the source the waves get closer and net frequency is increased (positive change). If the receiver is moving away, the net frequency is decreased.(negative change).