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The "Doppler Effect" and Electro-Magnetic Radiation

It should be noted that the Doppler Effect is an effect observed using sound waves. However an analogous effect can be observed using e-m radiations such as light, radio waves etc.

The analysis of the "Doppler Effect" in e-m radiations is different from that shown above because the velocity of light is thought to be the same for all observers (see "Relativity")

Measurements of the relative Doppler shift of radio waves are often used to measure relative velocities. Examples include Doppler Radar used to guide aircraft during landing and radar "speed traps" used by police.














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