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And that means radiation of energy, and that energy has to come from inside the atom itself.
意味着有能量的辐射，这些能量来自于原子本身。
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And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.
当粒子或其他东西,通过辐射或粒子的方式，并且能量高于临界值,撞击到硫化锌的表面上的时候，就会发光。
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For example, if we talk about photons, of course, we also just mean light, sometimes we refer to this as electromagnetic radiation, and there's several ways that you might be asked this in a problem or that you might be asked to answer.
举例来说，如果我们讨论光子，当然我们也叫做光，有时候我们看作是电磁辐射，而且这里有几种方式,你可能会在题目中被问到,或者被提问回答。
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It's good to have a vector pointing in the radial direction of length one.
所以引入这么一个模长为 1,方向沿圆心向外辐射的矢量作用很大
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He used various forms of high-energy radiation in order to make the droplets bear a charge.
他使用很多形式的高能辐射,为了就是使这些液滴带电。
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So quantization of radiation was already established as of about 1900.
所以辐射的量子化概念,在1900年左右就建立了。
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And, it will be accompanied by radiation.
这时会伴随着辐射。
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Radiation is the emission of energy.
辐射会发出能量。
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So what we'll do is this problem here, which is let's calculate out what the wavelength of radiation n would be emitted from a hydrogen atom if we start at the n equals 3 level and we go down to the n equals 2 level.
我们来做这个问题,让我们来计算一下,从n等于3到,等于2能级氢原子辐射的波长是多少。
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And then he analyzed the components of that radiation and this is what he found.
然后他分析了，这种辐射的组成部分,这就是他的发现。
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Second, even if it didn't collapse, they said you've got a radiation problem.
第二点，即使不坍塌，他们说会存在辐射问题。
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About 10 to 15 years later, another physicist, Ernest Rutherford, actually put this plum pudding model to test, Ernest Rutherford and he did it through studies that he'd been doing on radiation that was emitting something called alpha particles.
因此我们要，在上面再做改进,大概过了10到15年，另外一个物理学家,用实验来检测这个李子布丁模型,他一直从事alpha粒子辐射研究。
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