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When the light shines just the right way, bronze squares in the doors seem to catch fire.
VOA: special.2010.02.03
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We've got wind, we've got a primeval chaotic, Watery mass or deep, and then surprise, There's just a word,"Let there be light."
我们有了气流，有了原始的混乱，狂放的水流，混沌，但奇怪的是，只有一句话，“要有光“
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But it just means there's so much more space and there's so much more light
但是这也只是说明，这里有更多的地方和光照，
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And then,when my head was well in the room, I undid the lantern just so much that a single thin ray of light fell upon the vulture eye.
VOA: special.2009.05.16
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Just like we see destructive interference with water waves or with light waves, we can also see destructive interference with orbitals.
就像我们看到水波,和光波的相消干涉，我们也可以看到轨道的相消干涉。
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The commander of the British Army's 19th Light Brigade, Brigadier Tim Radford, just returned from Afghanistan.
VOA: standard.2009.10.12
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I wish it didn't say "exit," but it does say "exit," because that kind of weakens my point, but over many auditorium doors a red light just hangs there.
如果这些灯上没有注明出口就好了“,因为这样会削弱我要证明的观点，礼堂的门上一般会挂着一盏红灯。
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In light of the fact that I have just sent you paper topics, my lecture today is going to do two things.
根据我刚发给你们的论文题目，我今天的课程将要完成两件事。
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So if we just go a tiny distance in here, this is Bud Light and so on.
那么如果我们稍微走点距离,这是百威淡啤酒,以此类推
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And the myth has to do with these sort of pictures I was just describing where we don't actually live on the surface of the Earth of in the light, but rather live in certain hollows in the dark where we're mistaken about the nature of reality.
那个传说与我一直形容的,这个大局有关,我们并不真正生活在地表,生活在阳光里,而是生活在某种暗无天日的黑洞中,一个我们都误解了现实本质的地方
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And then he just takes that narrow column of light and he admits it to a prism. And what the prism does is takes a tiny, tiny difference in wavelength and refracts it through a different angle.
他只取了那个窄光柱,然后把它对准一个棱镜，棱镜所做的就是,测量出波长的细微差别,然后从不同的角度测定它的折射度。
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And you're feeling like you're in a light mood. You've just passed a test.
但你觉得你想看点轻松的，因为你刚刚通过一门考试。
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I am making light of it and I think it's somewhat justified, because the evidence is just so scanty.
我很鄙视这个观点,我认为我是有道理的,因为证据实在太有限
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this is perhaps the most interesting thing because it forces us to show the complexity, to see the complexity, of semiotic relationships: a red light, just to return to the Christian holiday, a red light on a Christmas tree.
现在我们讲到了一个耐人寻味论点,这个问题迫使我们要思考，符号系统之间复杂的联系：,当我们再圣诞节时看到红灯，圣诞树上的红灯。
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So, now we can talk about it in different terms, Ei for example, talking about e sub i, which is the incident energy or the energy of the light that comes in, or talking about work function here, and that's just another way to say threshold energy.
现在我们可以从不同的方面,来谈论它了，举例来说，它是入射能量或者进来的光的能量,或者谈论这里的功函数，它是另一种描述临界能量的方式。
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c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?
我们知道它只对光适用是因为在这个方程里有,光速，所以下次你们用这个方程前，如果你们要把它用到一个电子上，先问问你自己，电子的运动速度是光速吗？
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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。
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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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It'll still likely get stuck in that spot, but we'll just show you one more time the effects of the UV light, and actually we'll throw in an extra trick here, too.
它仍然像是在那点卡住了，但是我们还是会再展示一次,紫外光源的效应，事实上，我们也会引入一个新的技巧。
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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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Alright. So, since we have these terms defined, we know the frequency and the wavelength, it turns out we can also think about the speed of the wave, and specifically of a light wave, and speed and is just equal to the distance that's traveled divided by the time the elapsed.
好了，我们已经定义了，这些术语，我们知道了，频率和波长，现在可以来考虑,波的速度了，特别是光波的速度，速度等于它走过的距离,除以所用的时间，因为我们。
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And when we look at this, it's actually split by what's called a nodal plane, which is pointed out in light orange here on this picture, but what we just mean is that there is this whole plane that separates the two lobes where there is absolutely no electron density.
我们来看这里，实际上它被一个节面分开，在这图里用淡黄色表示，这意味着这个分开,两个叶瓣的平面上,是完全没有电子密度的。
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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。
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All right. Just some other examples: a red light over a street door.
好吧，现在让我们看看例子：,临街门上的红灯。
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Intensity, if we increase the intensity, we're not increasing the energy in each photon, we're just increasing the number of photons that we're shooting out of our laser, whatever our light source is.
强度，如果我们增加强度，我们增加的不是,每个光子的能量，我们增加的仅仅是,从我们激光源射出的光子数，无论我们的光源是什么。
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So, most people could recognize that light wave a has the shorter wavelength. We can see that just by looking at the graph itself -- we can see certainly, this is shorter from maxima to maxima.
0秒钟，好的，不错大部分,同学都可以判断出来这个光波的,波长更短，我们仅通过,看图就能看出来-可以。
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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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