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One shows the remains of a dying star four thousand light years away which has thrown off a cloud of glowing hydrogen gas.
VOA: special.2009.09.30
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And instead of having the electron giving off energy as a photon, instead now the electron is going to take in energy from light and move up to that higher level.
与电子以光子形式施放能量不同,我们现在要从光中,获得能量到一个更高的能级。
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And if we do, in fact, hit it with light to get the electrons off, it will go back to the straight up in position, or if it gets knocked hard enough it does that, too.
而且如果我们这么做，事实上，用光轰击它以逐出电子，它就会在原位置沿直线返回，或者如果它被撞击的足够猛烈,也会出现上述现象。
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He could turn off a light and then jump into his bed before the room got dark.
VOA: special.2009.01.24
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we race off under the compulsion of the meaning of the red light, which is "go," right?
他看到红鼻子的驯鹿就出发了，因为红色代表出发，对吗？
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They were not hot enough -- like stars-- to give off light.
VOA: special.2009.04.29
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On day four, The heavenly bodies that give off light by day or night are created.
在第四天，那些在白天或者晚上发光的天体被创造了。
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If dark matter particles exist, scientists say, they should be able to observe a small amount of light given off when they hit the nucleus of a xenon atom.
VOA: special.2009.07.21
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A gig is 10 to the 9, so it does two operations in the length of time it takes light to get from one foot off the table down to the table. That's amazing.
因此光行进一英尺的,时间内电脑可以,进行两次基本运算,这太神奇了。
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The body is having all sorts of light bounce off my eyes of various wavelengths.
身体可以通过不同的,波长把光线反射进我的眼睛
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You don't need a light switch or a light bulb or an iPhone app to turn something on or off.
你不需要一个电灯开关,或者一个电管,或者打开关闭一个iPhone应用程序。
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That makes sense because we're losing energy, we're going to a level lower level, so we can give off that extra in the form of light. And we can actually write the equation for what we would expect the energy for the light to be.
这很合理，因为我们在损失能量,我们要到一个更低的能级去,我们要以光的形式给出额外的能量,我们可以写下光能量的方程。
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There's nothing more exciting to see with your glasses on, while you look nice. You can take those off if you wish to, or you can try to just be splitting the light in the room until the TAs grab your glasses, either is fine.
虽然你们戴着眼镜很好看，但现没什么东西需要戴着看了，你们可以拿掉了,或者你们在助教收上来之前，试试看分开屋里的光。
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It just checks and sees what kind of light frequencies are bouncing off the object.
只要能让它检验出,物体反射的光的频率
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And what we predict as an energy difference between two levels, we know should correspond to the energy of light that's either emitted, if we're giving off a photon, or that's absorbed if we're going to take on a photon and jump from a lower to a higher energy level.
我们预测，两个能级之间的能量差，我们知道，它要么和发出的光有关,如果它发出光子的话，要么它吸收光子,从低能级跃迁到，更高能级上去。
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So, one thing they did, because it was so easy to measure kinetic energy of electrons, is plot the frequency of the light against the kinetic energy of the electron that's coming off here. And in your notes and on these slides here, just for your reference, I'm just pointing out what's going to be predicted from classical physics.
他们做的其中一件事,因为测量电子动能是很容易的，就是画出光的频率,和出射电子动能之间的关系,在讲义的这里，仅仅是,为了做个比较，我要指出，经典物理所给出的预测,这个不作为对你们的要求。
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