"There's a girl named Zhi Nu and a boy named Niu Lang.

VOA: special.2010.02.08

He came up with the relationship that nu bar, which is called wave number --He found the reciprocal.

他也提出了它们与波数的关系，波数是波长的倒数。

麻省理工公开课 - 固态化学导论课程节选

And the relationship that he put forth is that the momentum is equal to Planck's constant times nu divided by the speed of light, or it's often more useful for us to think about it in terms of wavelength.

爱因斯坦提出的关系式是,动量等于普朗克常数,乘以υ除以光速，或者用波长来表示,通常更容易让我们想明白。

麻省理工公开课 - 化学原理课程节选

Well, the energy of the photon, hv we know from Planck, is h nu, which is hc over lambda.

好吧，光子，我们从普朗克那得知，它是，即hc/lambda，波长。

麻省理工公开课 - 固态化学导论课程节选

nu We know that wavelength is equal to c over nu.

我们知道波长等于c除以。

麻省理工公开课 - 化学原理课程节选

We know that nu is equal to c over wavelength.

我们知道υ等于c除以波长。

麻省理工公开课 - 化学原理课程节选

Oh, E equals h nu. I will plug in.

哦，E=hv，我要算出来。

麻省理工公开课 - 固态化学导论课程节选

So, since the speed of light equals lambda nu, we can say that momentum is equal to h divided by lambda.

所以，既然光速等于λ乘以υ,我们可以得到动量等于h除以λ

麻省理工公开课 - 化学原理课程节选

So this means we now have a new way of thinking about the photoelectric effect, and that nu is the idea that h times nu is actually an energy.

这意味着我们有一种,新方法来考虑光电效应,这个概念就是h乘以。

麻省理工公开课 - 化学原理课程节选

So, the very important conclusion that nu Einstein made here is that energy is equal to nu h times nu, or that h times nu is an actual energy term.

做出的重要结论就是能量,等于h乘以,或者说h乘以,是一个能量项。

麻省理工公开课 - 化学原理课程节选

- There are a few equations that you need to memorize -- those are the very simple -- very, very simple equations, such as e equals h times nu -- hopefully you don't have to sit down and try to memorize that, hopefully we all know that already.

只有几个公式是需要记住的-,它们都非常简单，非常非常简单，比如，E，等于，h，乘以，ν,希望大家不需要再专门去背了，希望我们已经都记住了。

麻省理工公开课 - 化学原理课程节选

This is h nu. X-rays coming in.

这是hv，X光出现了。

麻省理工公开课 - 固态化学导论课程节选

The period, that's right. So, it's going to take one period to move that long. And another way 1 we can say period is just 1 over nu or 1 over the frequency So, now we know both the distance traveled and the time the elapsed.

还是？周期，对的,它需要一个周期的时间,另一种说法是周期是,除以nu，也就是1除以频率,现在我们同时知道了。

麻省理工公开课 - 化学原理课程节选

So, we can just plug it in. Speed is equal to the distance traveled, which is lambda over the time elapsed, which is 1 over nu. so, we can re-write that as speed is equal to lambda nu times nu, and it turns out typically this is reported in meters per second or nanometers per second.

经过的距离和所花的时间,我们把它们带进来,速度等于经过的距离,也即是lambda除以,所花的时间,通常它的单位,是米每秒或者纳米每秒。

麻省理工公开课 - 化学原理课程节选