The waves that exhibit the doppler effect are sound wave, water wave and light wave.
The term "Doppler effect" was named after an Austrian mathematician and physicist known as Christian Johann Doppler while studying the starlight in relation to the movement of stars.
In Physics, Doppler effect can be defined as the change in frequency of a wave with respect to an observer in motion and moving relative to the source of the wave.
Simply stated, doppler effect is the change in wave frequency as a result of the relative motion existing between a wave source and its observer.
An example of the Doppler effect with respect to sound wave is an ambulance driving towards you with its siren on, and you perceive the pitch (intensity or loudness) of the siren to increase.
In conclusion, Doppler effect is a phenomenon that is generally applicable to sound, water and light wave.
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