Relativity-Symmetry in Physics (contd..)
Welcome back to 8.033!Albert A. Michelson, 1852-19311st American to win Nobel Prize (1907)Image courtesy of Wikipedia.SUMMARY OF LAST LECTURE: SYMMETRY IN PHYSICS, I:•Key concepts:frame, inertial frame, transformation, invariant, invariance, symmetry, relativity•Symmetry examples:translation, rotation, parity, boost•Million Dollar question:what are the symmetries of physics?TODAY’S TOPIC: SYMMETRY IN PHYSICS, II•Symmetry of electromagnetism (wave equation, light propagation)•Does speed of light depend on wavelength, motion of source or motion of observer?•How reconcile 8.01 with 8.02?•How transform between inertial frames?•Key people:Michaelson& MorleyWHAT’S THE SYMMETRY OF CLASSICAL MECHANICS?ANSWER: Figures by MIT OCW. ? Image of a rocket.Figure by MIT OCW.WHAT’S THE SYMMETRY OF ELECTRO-MAGNETISM?SO WHICH DO YOU TRUST MORE:Classical mechanics, or E&M?Albert A. Michelson, 1852-1931Edward Williams Morley, 1838-19231st American to win Nobel Prize (1907)Does cdepend on observer motion (frame)?Image of a rocket.Figures by MIT OCW. ? Figure by MIT OCW.No, no and no!Aether rescue attempts (see Resnick Table 1-2)
Description
This is in continuation of the previous lecture and deals with symmetry of electromagnetism.It tries to explore whether speed of light depends on wavelength, motion of source or motion of observer and how to transform between inertial frames.Transforming wave equation using Galilean Transformation it shows that classical mechanics is invariant under Galilean transformation but electromagnetism is not.It tries to find out what is the transformation law that leaves Physics invariant.
Prof. Max Tegmark,8.033 Relativity, Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed Sept 16th,2011). License: Creative Commons BY-NC-SA: http://ocw.mit.edu/terms/#cc
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