2011-11-09 -- Relativity

2011-11-09 -- Relativity - Relativity History 108 November...

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Relativity History 108 November 9, 2011 Prof. November
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How Fast Does Light Travel? Aristotle : “light is due to the presence of something, but it is not a movement” Ptolemy : light travels at infinite speed Light is emitted from eye and returns instantaneously Alhazen : Light has a high but finite speed Descartes : Finite speed of light would wreck astronomy Eclipses would not line up as predicted
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Finding c c = speed of light (1926) ~300,000 km/s = 186,000 mph Galileo’s lantern test Conclusion: light travels at 10x the speed of sound Ole Christensen Rømer (1687): Io emerges from Jupiter’s shadow at the wrong time Precise timing depends on relative position of Jupiter and Earth Conclusion: c = 270,000 km/s
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Ether 19 th Century: Light travels through ubiquitous medium (ether) Anti-Newtonian Light has no substance; ether does Ether is not constant Irregularities fluctuations in the speed of light, electricity, magnetism Understanding ether = understanding the Urphaenomen governing physics
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This note was uploaded on 12/13/2011 for the course HIST 108 taught by Professor Dr.november during the Fall '11 term at South Carolina.

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2011-11-09 -- Relativity - Relativity History 108 November...

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