Doppler Effect statement, The Doppler effect is a wave phenomenon that occurs when there is relative movement between a wave source and a receiver , Perceived Frequency (f'), The frequency heard by the observer, Real Frequency (f), The actual frequency of the sound produced, When the sound device is aproaching to the observer:, It has a higher pitch, When the sound emitter is moving away from the observer:, It has a lower pitch, Speed of Sound (Vs), 340 m/s, Observer Speed (Vo), The speed at which the observer is moving, Source Speed (Vf), The speed at which the sound source is moving, Doppler effect formula, f' = (Vs ± Vo / Vs ± Vf) f, Pitch heard from a train moving towards you at 20 m/s emitting a sound of 400 Hz, 425 Hz.

Doppler effect

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