Question

A shift of one fringe in the Michelson-Morley experiment
corresponds to a change in the round-trip travel time along
one arm of the interferometer by one period of vibration
of light (about 2 × 10−15 s) when the apparatus is rotated
by 90◦. what velocity
through the ether would be deduced from a shift of
one fringe? (Take the length of the interferometer arm to
be 11 m.)

Answer 1