Purdue PHYS 342 L12.2: Special Relativity-Introduction: Measuring the Speed of Light

Table of Contents:
00:09 Lecture 12.2: Measuring the speed of light
00:22 Consider two light beams in a fixed frame moving in opposite directions
05:44 A. What does S' measure for light beam from L to R?
08:20 B. What does S' measure for light beam from R to L?
09:33 Summary
10:52 But there is a subtle problem…..
14:15 The speed of light should depend on the reference frame
16:33 The Answer Depends on the Reference Frame
19:35 In contrast to Newtonian mechanics,
19:37 The Idea of the Aether (circa 1880)
22:01 What is the rest frame for the aether?
23:18 Up Next

Purdue PHYS 342 provides an introduction to the physical principles underlying topics in Modern Physics. This course is intended to provide engineering undergraduate students with a firm base from which they can extend their understanding of the quantum world.

[iwonakozlowska]

What does it actually mean to measure time? Maybe it is just that moving clocks measure time differently, but time as such is immutable!