Suppose the observer in Figure 14.11a, at rest relative to the ground and standing midway between the two sources when they emit signals, is joined by another observer who moves along with the simultaneity detector.

(a) Based on what the detector tells them, do the observers agree that the light signals do not reach the detector at the same instant?

(b) How does each observer explain why the signals don't reach the detector at the same instant?

Transcribed Image Text:

Figure 14.11 If the sources and the simultaneity detector move together at high speed relative to an observer, then (a) events that are simultaneous to the observer will not be so to the detector. (b) To make the signals strike the simultaneity detector at the same instant, the source behind the detector must emit its signal before the source in front of the detector. (a) Events are simultaneous to observer (b) Events are simultaneous to simultaneity detector event 1 Signals simultaneous to observer... M event 2 simultaneity detector event 1 M but not to detector........ Signals simultaneous to detector." Ca event 2