time is the consequence of event, and it can only be measured


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送交者: steven 于 2007-11-07, 16:55:11:

回答: 要给出时间的定义。 由 湘女 于 2007-11-07, 16:38:24:

if events take place. Such as changes of atomic states. One second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom at a temperature of 0 Kelvin. That is how atomic clock works. No just GPS, all other high speed objects, like shuttles, spacecrafts which have atomic clocks on board show the similar clock drift. Air is certainly not a factor here. Remember science is a logical interpretation of observable events. You can define time as you wish, the point is, it can be observed the durations of that 9,192,631,770 periods of the radiation of two caesium 133 atoms are different, when one is in high speed and the other is in low speed. The difference agrees with the relativity prediction. Other experiments with different materials and different physical properties show similar result. So we accept the interpretation of relativity. There may be other interpretations, as long as those interpretations agree with observable facts, and logically sound, we can accept those interpretations too.



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