Doppler Effect

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The Doppler Effect is the perceived change in sound frequency that occurs in relation to an observer when the source of a sound is moving toward or away from the observer. When the source is approaching, the sound appears to increase in frequency and become higher in pitch. When the source is moving away, the sound appears to decrease in frequency and become lower in pitch.

About The Author

Matt Slick is the President and Founder of the Christian Apologetics and Research Ministry.