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Lect_30_note - Chapter 39 Relativity Triumph of Classic...

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Chapter 39 Relativity
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Triumph of Classic Physics By the late 19th cent. most of classical physics was complete, and optimistic physicists turned their attention to what they considered minor details in the complete elucidation of their subject.
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Galilean Relativity v u u = u + v
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Galilean Relativity z There is no absolute inertial frame of reference z According to the principle of Galilean relativity , the laws of mechanics must be the same in all inertial frames of reference
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Maxwell’s Equations say 1 oo vc μ ε == Vacuum permittivity ε 0 = 8.89·10 -12 C 2 /N·m 2 Vacuum permeability μ 0 = 4 π× 10 7 N·A 2 . z The speed of light in free space is c = 2.99 x 10 8 m/s Which reference did Maxwell use? Aether is an absolute reference !
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Aether z Physicists in the late 1800s thought light moved through a medium called the a ether – an absolute reference in which ε 0 and μ 0 are constants z Maxwell identified 'light' to be an electromagnetic aether wave
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Aether z The earth is moving in this absolute reference Earth V c
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Effect of Aether Wind on Light Speed
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Michelson-Morley Equipment z Used the Michelson interferometer z Arm 2 is aligned along the direction of the Earth’s motion through space z The interference pattern was observed while the interferometer was rotated through 90 ° PLAY ACTIVE FIGURE JAVA
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Michelson-Morley Results z Measurements failed to show any change in the fringe pattern z Light requires no medium for its propagation z
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_30_note - Chapter 39 Relativity Triumph of Classic...

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