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how to measure the speed of light with a laser. The National Bureau of Standards in Boulder Colorado used helium-neon lasers and meticulously accurate cesium clocks to measure the speed of light. Procedure Dependent Variable Bibliography A device that produces a visible laser beam.
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In this video I demonstrated the direct measurement of the speed of light using an off-the-shelve red laser diode and a photomultiplier. This is exactly how Roemer estimated the speed of light. We describe an undergraduate laboratory that combines an accurate measurement of the speed of light a fundamental investigation of a basic laser system and a nontrivial use of statistical analysis.
Beam back to a point at the measuring surface.
So just measuring the change in apparent period and the change in distance gives an estimate for the speed of light. Measuring the speed of light the old fashioned way. We describe an undergraduate laboratory that combines an accurate measurement of the speed of light a fundamental investigation of a basic laser system and a nontrivial use of statistical analysis. In this video I demonstrated the direct measurement of the speed of light using an off-the-shelve red laser diode and a photomultiplier.
