Christian Doppler
Austrian mathematician and physicist (1803-1853)
Summary
Updated 2026-05-29
Austrian physicist who figured out that moving sound waves change pitch depending on how fast you're going toward or away from them—the principle that bears his name and shows up everywhere from ambulance sirens to astronomy.
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Christian Andreas Doppler was an Austrian mathematician and physicist. He formulated the principle – now known as the Doppler effect – that the observed frequency of a wave depends on the relative speed of the source and the observer.
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- Pantheon 2.0High confidencedatabase · pantheon.world
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