Christian Doppler
Physicist: A person who studies the kind of science that is about how the world and universe work.
Hypothesis: A guess about what will happen, usually in scientific experiments.
 Johann Christian Andreas Doppler (November 29, 1803–March 17, 1853) was an Austrian mathematician and, most famous for theof what is now known as the Doppler effect, which is thechange in frequency andof a wave that isby an observer moving relative to theof the waves.
Apparent: Easy to see, realize, or understand.
Wavelength: The length of a wave.
Perceived: Noticed through one of the senses.
Source: The place something came from originally.
Stone-mason: A person who builds with stone.
Physical: Related to the body.
Astronomy: The study of stars and space.
 Christian Doppler was born in Salzburg, Austria as the son of a. However, he could not work in his father's business because of his generally weakcondition. After completing high school, he studiedand mathematics in Vienna and Salzburg and started to work at the Prague Polytechnic (now Czech Technical University), where he was appointed professor for mathematics and physics in 1841. (Note: At that time, the present Czech Republic was ruled by the Empire of Austria.)
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 Only one year later at the age of 39 hehis most notable work on the Doppler effect (forto be noticed in the change of sound of a quickly passing). The German title was "Über das farbige Licht der Doppelsterne und einige andere Gestirne des Himmels - Versuch einer das Bradleysche Theorem als integrirenden Theil in sich schliessenden allgemeineren Theorie" (English translation: On the colored light of thestars and otherbodies - Attempt of a more generalincluding Bradley'sas anpart). An English translation of his original 1842 work in German can be found in the book by Alec Eden together with the German. Besides light, Doppler also mentioned sound in his 1842 work. In this work, Doppler tried to explain the color of binary stars. Alec Eden did not feel confident regarding Doppler'sregarding the color of binary stars but he was confident of Doppler's conclusions regarding the Doppler effect of sound. The Doppler effect of sound wasby John Scott Russell in 1848. In his time in Prague as professor he published more than 50 articles in mathematics, physics and astronomy. (Note: The Bradley in the title of Doppler's 1842 work is James Bradley of Britain.)
Binary: Having two equally important parts.
Refracted: (Light) changed in direction as a result of entering something different.
Celestial: Relating to the sky or space.
Theory: An idea that tries to explain an observation.
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Incidents: Events.
Fled: Escaped.
 Hisin Prague was interrupted by theof March 1848, when heto Vienna. There, he was appointed head of the Institute for Experimental Physics at the University of Vienna in 1850. During his presence at the University of Vienna, Doppler, along with Franz Unger, played an influentialin the development of young Gregor Mendel, who later became thefather of. (Note: Gregor Mendel studied in the University of Vienna from 1851 to 1853. At that time, Doppler served as a professor there.)
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Pulmonary: Related to the lungs.
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Tomb: A small building for dead bodies.
Venetian: Related to Venice.
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 He died from ain Venice at age 49 on March 17, 1853. Hiscan be found just inside the entrance of theislandof San Michele. (Note: In 1853, Venice was also ruled by theof Austria. It was like Doppler just moved from one part of the Austrian empire to another part of the same empire. Now Venice is part of Italy, so Doppler's tomb ends up in Italy instead of in Austria.)
Emperor: The male ruler of an empire.
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