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Set up two detectors on a railroad car (spaced along the direction ofthis
travel). Wire the detector outputs into a coincidence counter whose
output blows the train whistle when coincident events occur. All of
apparatus is on the moving train.light
Now add, on the train, an isotropic light source midway between the
detectors. When this light source fires a pulse, the train whistle will
blow.
A second observer standing on the ground sees that the whistle was
triggered by light arrivals which were not simultaneous in the ground
frame, but he realizes that the apparatus is rigged to fire only for
arrivals which are simultaneous in the TRAIN frame.
Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor