So we've seen one example of this, this idea of walking through all the integers looking for the square root.
现在计算机速度很快了,我可以把这个数字设的更大点,计算机会去很快的做这个事情。
So, if we do this calculation for an electron, saying it moves at 10 to the 5 meters per second, then what we end up with for a wavelength is 7 times 10 to the -9 meters.
如果我们已知电子以,10的5次方每秒的速度运动,那么做一个计算,可以得知它的波长是,7乘以10的负9次方米。
Well, so much for the speed of the computer.
好的,计算机的速度就这么快。
Just take the derivatives and that's the velocity vector.
直接计算对时间的导数就是速度矢量
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