It is an electron beam. In the 1890s, the latter part of the 19th century a very fashionable word was "ray."
那是个电子束,在十九世纪九十年代,就是19世纪末,一个很时髦的词汇-“光线“
So this gives you a little bit of an idea of just how many individual photons there are in a laser beam of light. This is a huge number of photons.
这个给你们一点思路关于,一个激光束有多少独立的光子,这是一个巨大的光子数目。
And now we repeat the experiment, only this time we come with an electron beam.
现在来重复一下实验,仅在这次我们得到了电子束。
So rather than calling this an electron beam, this was called a cathode ray.
因此我们最好别叫它电子束,而是阴极射线。
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