来自《耶鲁大学开放课程：新生有机化学 第5集 第5集》
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An electromagnetic wave.电磁波 -
It's an electromagnetic wave. Okay.它是一种电磁波 -
Now I've seen -- indeed it is --我见到过 确实 -
I've seen waves on the ocean, right?我见过海洋上的波浪 -
Does it mean that electromagnetic waves are like those waves?那么电磁波是否就像那些波浪 -
In what way is an electromagnetic wave a wave?电磁波又是如何形成波的 -
What's wavy about it?形成了什么样的波 -
Well you can make a graph that's a wave, that involves light.其实你可以将波画出来 包括光 -
So here what we're going to plot is the force on a charge.在这里我们要画出电荷上的力 -
The charge is at a particular position.电荷在一个特定的位置 -
We'll have the charge over there on the right;我们将它放在右侧 -
it's fixed there, and we're going to measure the force on it固定在那 然后测量其上的作用力