sananda Posted August 31, 2009 Share Posted August 31, 2009 Hi Guys, Just wondering does anyone have a list of the major experiments that have been performed with regard to light speed and movement of sensors. How has light speed constancy been proven through experimentation in this regard. Has someone shone light pulses at a sensor moving forward and backwards towards the light and measured the length of the pulses? If anyone has a list of references it would be great. Link to comment Share on other sites More sharing options...
Mr Skeptic Posted August 31, 2009 Share Posted August 31, 2009 The most famous was the Michelson-Morley experiment, where they measured the speed of light with absurd precision in two different directions. As for the pulse of light you are talking about, the pulse will get longer or shorter (not faster) and will get red or blue shifted. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted August 31, 2009 Share Posted August 31, 2009 This guy was the first to make the measurements back in the 17th century: http://en.wikipedia.org/wiki/Ole_R%C3%B8mer Link to comment Share on other sites More sharing options...
sananda Posted August 31, 2009 Author Share Posted August 31, 2009 (edited) That experiment was designed to measure ether drag or wind... and funny enough it did and still does, though it's nothing like as strong as expected. There's no moving parts relative to the light source... It just shows that firing light into ether in all directions makes negligible difference to the measurement of light speed. Merged post follows: Consecutive posts mergedhas anyone measured it using a moving detector such as a satellite? Edited August 31, 2009 by sananda Link to comment Share on other sites More sharing options...
Klaynos Posted August 31, 2009 Share Posted August 31, 2009 Is the earth not moving relative to say the sun? Pretty sure it is... The MM experiement showed that there was no aether effect within what was required by any Aether theory. If you claim otherwise you need to show mathematically the value of the shift of the speed of light you'd expect to find. Link to comment Share on other sites More sharing options...
sananda Posted August 31, 2009 Author Share Posted August 31, 2009 Is the earth not moving relative to say the sun? Pretty sure it is... The MM experiement showed that there was no aether effect within what was required by any Aether theory. If you claim otherwise you need to show mathematically the value of the shift of the speed of light you'd expect to find. Are you suggesting these experiments used light from the sun or that they incorporated the suns gravitational effect on ether into the calculations? Link to comment Share on other sites More sharing options...
Klaynos Posted August 31, 2009 Share Posted August 31, 2009 I'm suggesting we are moving. Do you mean using a moving lightsource relative to the detectors? I don't think that would work for an MM experiment, but similar things are done... I'd suggest you read about things like: http://en.wikipedia.org/wiki/Hammar_experiment http://en.wikipedia.org/wiki/Michelson%E2%80%93Morley_experiment#Aether_dragging Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted August 31, 2009 Share Posted August 31, 2009 Is the earth not moving relative to say the sun? Pretty sure it is... The MM experiement showed that there was no aether effect within what was required by any Aether theory. If you claim otherwise you need to show mathematically the value of the shift of the speed of light you'd expect to find. Any Aether theory? Link to comment Share on other sites More sharing options...
Klaynos Posted August 31, 2009 Share Posted August 31, 2009 Any Aether theory? Any superluminous aether that was proposed at the time. Link to comment Share on other sites More sharing options...
sananda Posted September 1, 2009 Author Share Posted September 1, 2009 Michelson Morley's experiment was looking for ether drag as they thought like everyone else that light propagated along this ether... they did these experiments in basements and they did find drag, maybe it was biased or caused by error but most of the experiments did find it... I love the fact that one of them tried it in a place where there were thinner walls because he couldn't let it go... The experiment was like throwing a ball up in the air whilst sitting on a open top bus... wind will catch the ball... but maybe simply being on a planet meant it was more like throwing it on a closed top bus with only the window open? Either way, it was valid for some scientists to remove ether at this point and explore that possibility, but we know it exists today, though we now call it something else entirely... so why is it not valid to try and solve it with this ether in mind? Merged post follows: Consecutive posts mergedI'm suggesting we are moving. Do you mean using a moving lightsource relative to the detectors? I don't think that would work for an MM experiment, but similar things are done... I'd suggest you read about things like: http://en.wikipedia.org/wiki/Hammar_experiment http://en.wikipedia.org/wiki/Michelson%E2%80%93Morley_experiment#Aether_dragging just reading those links, both test for ether drag not for light speed at a moving target. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted September 1, 2009 Share Posted September 1, 2009 Any superluminous aether that was proposed at the time. Thanks. Link to comment Share on other sites More sharing options...
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