Hippolyte Fizeau

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Hippolyte Fizeau
Hippolyte Fizeau.jpg
Hippolyte Fizeau
Born 23 September 1819
Paris
Died 18 September 1896 (aged 76)
Venteuil
Nationality French
Known for Doppler Effect
Fizeau-Foucault apparatus
Capacitor
Awards Rumford Medal (1866)
Scientific career
Fields Physics
Armand Hippolyte Louis Fizeau (23 September 1819 – 18 September 1896) was a French physicist, best known for measuring the speed of light in a namesake experiment.

Biography

Fizeau was born in Paris to Louis and Béatrice.[1] His earliest work was concerned with improvements in photographic processes.[2] Following suggestions by François Arago, Léon Foucault and Fizeau collaborated in a series of investigations on the interference of light and heat. In 1848, he predicted the redshifting of electromagnetic waves.[3]

In 1849, Fizeau calculated a value for the speed of light more precise than the previous value determined by Ole Rømer in 1676. He used a beam of light reflected from a mirror eight kilometers away. The beam passed through the gaps between teeth of a rapidly rotating wheel. The speed of the wheel was increased until the returning light passed through the next gap and could be seen.

Fizeau calculated the speed of light to be 313,300 kilometres per second (194,700 mi/s), which was within five percent of the correct value (299,792.458 kilometers per second). Fizeau published the first results obtained by his method for determining the speed of light in 1849. (See Fizeau-Foucault apparatus.)[4] Fizeau made the first suggestion in 1864 that the "length of a light wave be used as a length standard".[5]

Fizeau was involved in the discovery of the Doppler effect.[6]

In 1853, Fizeau described the use of the capacitor (sometimes called a "condenser") as a means to increase the efficiency of the induction coil. Later on, he studied the thermal expansion of solids, and applied the phenomenon of interference of light to the measurement of the dilatations of crystals. He became a member of the Académie des Sciences in 1860 and a member of the Bureau des Longitudes in 1878. He died at Venteuil on September 18, 1896.

"Fizeau" is one of the 72 names inscribed at the base of Eiffel Tower, and of the 72 scientists and engineers listed on the tower, Fizeau is the only one who was still alive when the tower was opened to the public for the 1889 World's Fair. The crater Fizeau, on the far side of the moon, is named after him.

See also

References

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  2. Lua error in Module:Citation/CS1 at line 746: Argument map not defined for this variable.
  3. Lua error in Module:Citation/CS1 at line 746: Argument map not defined for this variable.
  4. Lua error in Module:Citation/CS1 at line 746: Argument map not defined for this variable.
  5. Physics part 1 Resnick/Halliday pg.5
  6. Lua error in Module:Citation/CS1 at line 746: Argument map not defined for this variable.

External links

  • Lua error in Module:Citation/CS1 at line 746: Argument map not defined for this variable..
Attribution
  •  This article incorporates text from a publication now in the public domainLua error in Module:Citation/CS1 at line 746: Argument map not defined for this variable.Template:Eiffel names