Doppler effect. Illustration showing the bunching up of waves in front of a moving source. The source is moving from left to right. The waves behind the source are more spread out. In light sources this change in wavelength creates a blueshift for an approaching source and a redshift for a receding source. With sound sources it creates the change in pitch as the source moves past the observer.

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TOP28328666

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達志影像

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RM

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