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Unformatted text preview: distance L within the time t, then we
know v: L=(u’-v)t, therefore v = u’ – L/t
But: Very difficult with light! u’ = c t ~ 10ns and v ~ 0.0001*c. We would have to measure t with an absolute precision of
~0.0000000000001s and we have to know c very precisely! B A u’-v L Compare the round-trip times tA and tB for paths A and B.
This has the great benefit, that we do not have to
measure the absolute times tA and tB (which are only a
few ns) and we are less sensitive to uncertainties in the
speed of light. Instead we can measure the difference
(more or less) 2 Michelson and Morley Intermezzo: Interferometers Mirrors L -v
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- Spring '14