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Hi! Do "light clocks" (the things that bounce a particle of light between two or more mirrors - has to do with relativity) really exist? Would it be possible to make a "light clock"? Thank you for your help!
Question Date: 2010-04-16
Answer 1:

Not sure - I'm doing some leg work on the internet looking, but the sources I'm finding aren't something I necessarily would trust.

Radar of course uses the same principle to measure the distance to a target. If the distance to the target were known, then you could use your radar essentially as a clock: the time it takes to emit a radar pulse and then for it to return could be calibrated based on the known distance and speed of light. However, you would not be able to make a time dilation-immune clock this way on a relativistic space ship because the space ship would experience Lorentz Contraction, which would change the distance between the radar emitter and the target, so they aren't known anymore.

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