A moving object’s length in a given frame is defined to be the distance between two events that occur at opposite ends of the object and that are simultaneous in that frame. Why is it crucial that the events we use to define a moving object’s length be simultaneous?
A. This is purely conventional: there is no other reason.
B. This choice makes it easier to use the Lorentz transformation equations to find the length.
C. If the events are not constrained to be simultaneous, then the length is poorly defined: its value would depend on the time interval between the events.
D. If the events are simultaneous, then the length will be a frame-independent quantity.
E. Other (specify)
C. If the events are not constrained to be simultaneous, then the length is poorly defined: its value would depend on the time interval between the events.
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