speed of light - astronomybelz/phys3719/presentations/richards.pdf · • a good model for testing...
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![Page 1: Speed of Light - Astronomybelz/phys3719/presentations/richards.pdf · • A good model for testing speed of light • The longer the distance D, the more accurate • Accepted value](https://reader034.vdocuments.us/reader034/viewer/2022050420/5f994a201a117b435c7b0279/html5/thumbnails/1.jpg)
Speed of LightSpeed of Light
Jonathan Richards
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HistoryHistory• Galileo: 1667• Roemer: 1675• Bradley: 1728• Fizeau: 1849• Foucault: 1862
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Galileo 1667Galileo 1667• Used laterns to measure speed of light• Not very accurate• Speed of light > 10x speed of sound
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Roemer and JupiterRoemer and Jupiter• Studied the moons• Moon not on schedule• 2x10^8 m/s
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Current ValueCurrent Value
c = 2.9979 x 10^8 m/s
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Foucault's MethodFoucault's Method
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Lab MethodLab Method
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Fixed MirrorFixed Mirror
Uncertainty:3.35 x 10^6 m/s
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Moving MirrorMoving Mirror
c = 2.9068x10^8 m/s
Error: 3.406 x 10^6 m/s
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Linear CorrelationLinear Correlation
r = .9477, .9164, -.5617, -.8984
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Chi SquaredChi Squared
6.04, 3.08, 6.64, 8.71
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Residual GraphResidual Graph
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ConclusionConclusion• A good model for testing speed of light• The longer the distance D, the more accurate• Accepted value for speed of light: 2.9979x10^8
m/s• Would like to try a longer distance D to see if it’s
more accurate• Would like to get the image in microscope focused
better.
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ReferencesReferences• Error Analysis, Taylor, John R., 2nd edition• http://www.speed-
light.info/measure/speed_of_light_history.htm