作者jokewind (悔过)
看板NTU-K9
标题俗话说:「人不可以自大」
时间Mon Oct 6 23:18:46 2003
今天我学弟很诚恳地问我一个普物问题
结果我想说我普物还算罩得住
就算经过两年一样宝刀未老
在他面前臭屁起来
结果才第一题就摃归了
可是我真得很怀疑
???????????????????这真得普物有教过吗???????????????????
After measuring the speed of sound U several times
student concludes that the standard deviation of his measurements is σ=12m/s
Assume that the uncertainties are random
and that the experiments is not limited by systematic effects
and determine how many measurements would be required to give
a final uncertainty in the mean of ±2.0m/s.
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