EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Christian Doppler (1803-1853), Austrian physicist. Doppler is famous for the Doppler effect, proposed in 1842. This states that a stationary observer listening to a sound source will hear the sound at a higher pitch if the source is approaching, and a lower pitch when receding, than when the source is still. He later discovered this effect with light waves; Doppler shift measurements are used in modern cosmology. Image from 'Stellar Motions' by William Wallace Campbell (1913) coloured by SPL.
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