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The Doppler Effect explains how the frequency of sound changes due to the motion of the source or listener. When a sound source moves closer, the perceived frequency increases, creating higher-pitched sounds. Conversely, as it moves away, the frequency decreases, resulting in lower-pitched sounds. This phenomenon has practical applications in various fields, such as Doppler radar for speed detection by police, weather forecasting to track storm movements, and even in astronomy to measure star speeds relative to Earth.
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Doppler Effect • Due to moving sound source • closer to source = greater frequency • farther from source = lesser frequency • as sound moves towards listener the sound can be a high pitched whine • as sound moves away from listener the sound can be a drumming sound
Uses of the Doppler Effect • Doppler radar • police use it to determine speed of car • the frequency of the reflected (echo) sound wave gives you the speed • weather forecasters can use it to determine how fast a storm front is moving • determine the speed of stars relative to Earth
Breaking the sound barrier! Why can’t I hear anything?
