Christian Doppler
Christian Doppler
1803-1853
Austrian physicist best known for research into the effects of motion on acoustic pitch (the Doppler effect). Doppler described the reason for the rising pitch of an approaching train whistle and the drop as the train passes. He suggested applying this principle to astronomical objects, where it has become a powerful tool for determining the motions of stars, verifying the existence of black holes, and measuring the size of the universe.
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Christian Doppler