The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

What we had just done a clicker question on is discussing light as a particle and the photoelectric effect, so we're going to finish up with a few points about the photoelectric effect today.

我们刚才做得课堂表决器那个问题,是讨论光作为一个粒子以及光电效应，所以今天我们将以一些,关于光电效应的观点作为结束。

麻省理工公开课 - 化学原理课程节选

So, it turns out that the photoelectric effect is not the only evidence for the fact that light has these particle-like characteristics.

所以，原来是光电效应,不是唯一的证明光具有,粒子特性的证据。

麻省理工公开课 - 化学原理课程节选

His specialty was representing the effect of light on an environment with color and loose brushstrokes.

VOA: special.2010.08.04

So, we'll take a little bit of a step back after we introduce quantum mechanics, and talk about light as a wave, and the characteristic of waves, and then light as a particle. And one example of this is in the photoelectric effect.

等我们介绍完量子力学后,我们要回过头来讨论下光,作为一种波和它的波动性特征,以及光作为一种粒子,其中的一个粒子就是光电效应。

麻省理工公开课 - 化学原理课程节选

"Chiaroscuro" is a method using light and shade as a painterly effect.

VOA: special.2010.09.15

So you know that x-rays are higher frequency than UV light, for example, that means it's also higher energy than UV light, and if you think back to our photoelectric effect experiments, do you remember what type of light we were usually using for those? Does anyone remember?

你们知道，X，射线的频率比紫外光高，这意味着，它的能量也比紫外光要高，那么，请大家回想一下我们的光电效应实验，大家还记得当时我们用的是什么光源吗？,有人记得吗？

麻省理工公开课 - 化学原理课程节选