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When the asbestos is seen in light near that wavelength, the minerals look darker than those around them.
VOA: special.2009.11.17
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And what we find out is the wavelength of a Matsuzaka fastball is 1.1 times 10 to the -31 meters.
我们算出松阪快球的波长,是1，1乘以10的负31次方米。
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De Broglie, 1924, in his PhD thesis says if an electron has wavelike properties this would be its wavelength.
德布罗意，1924年在他的博士毕业论文中说到,如果一个电子有类似波的性质,这就是它的波长。
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Many minerals in the asbestos family can absorb light with a wavelength measuring two-point three micrometers.
VOA: special.2009.11.17
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So there was a good question in Wednesday's class about the de Broglie wavelength and if it can actually go to infinity.
在周三的课上有个关于德布罗意波波长的问题,非常好，就是它能不能到无穷大。
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They repaired an existing infrared wavelength camera and spectrometer.
VOA: special.2009.09.30
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But de Broglie has told us that the wavelength is related to the instant velocity through this formula.
但德布罗意曾说过,波长是和瞬时速度相联系的,通过这个公式。
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And especially when we consider it, what tends to be important is the size of wavelength in relationship to its environment.
特别是当我们考虑它的时候，波长的量级和它所处环境,的关系就显得非常重要。
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And if the distance between the wall and the dam was large in comparison to the wavelength then what happens?
如果水槽壁,和屏障之间的距离,大于波长,会导致什么？
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So, if we're trying to figure out the wavelength of a Matsuzaka fastball, we need to consider the velocity first, which is 42 miles per hour.
如果我们尝试计算一个,松阪发出快球的波长，我们首先需要考虑速度，每小时为42英里。
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So really what we'll probably do is instead either give you the wavelength or the frequency and you'll go ahead and calculate the energy from there.
所以实际上我们可能的做法是,给你波长或者频率,然后你可以通过他们计算得到能量。
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And then since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.
然后因为我们有我的红色激光笔，我们也可以用它试一下，它的波长集中在700纳米处。
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So once we cover it, it will then be fair game to ask these photoelectron spectroscopy or these photoelectric effect questions using the wavelength of the electron.
所以一旦我们涉及到它，问及光电子能谱或者,用电子的波长问及,光电效应是一样的。
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If we have a high frequency, what about the wavelength, long or short? All right. Good. So we should always be able to keep these relationships in mind.
如果频率高，那波长是长还是短？,好，不错，我们要记住这些关系,类似的。
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If you're really into it and you're at MIT, maybe you want to know the wavelength of these average fastballs. So, let's go ahead and look at that.
如果你真的深入到这个问题中去,而且你在麻省理工学院，也许你会想知道这些快球的波长,所以我们继续来看这个问题。
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So, similarly in a case where instead we have a small energy difference, we're going to have a low frequency, which means that we're going to have a long wavelength here.
在这个例子里,能量差较小,我们得到的频率低,这意味这它的波长更长。
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Well, if I go through that, the wavelength of such a photon is going to be so big that I am back to measuring the dimension of the human hair with the yardstick.
好的，如果我做完了这个，那个一光子的的波长将成为,我将回头测量的,用一个尺度测量出人头发的尺寸。
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I would think that it would approach inifinity, and I would need to think about it and get back to you in terms of why we don't actually hit it and see something with an infinite wavelength.
我会认为波长会接近无穷大，而且我需要考虑一下,然后返回来告诉你,为什么我们没有说对,为什么我们没有看到,无穷大波长的东西。
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And the relationship that he put forth is that the momentum is equal to Planck's constant times nu divided by the speed of light, or it's often more useful for us to think about it in terms of wavelength.
爱因斯坦提出的关系式是,动量等于普朗克常数,乘以υ除以光速，或者用波长来表示,通常更容易让我们想明白。
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I would expect, whether you're a Red Sox fan or not, you to be able to look at a list of different pitchers and their average velocity for their fastball, and tell me who has the longest or the shortest wavelength.
无论你是否是一个红袜队球迷，我预想你会看到一系列,不同的投手和他们,投出快球的平均速度，告诉我谁有最长的,或者最短的波长。
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It's always good when we're looking for a wavelength that our answer is in a unit of length, that's a good sign already.
当我们计算波长时,如果答案是一个长度单位，那就是一个好的迹象。
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So, let's see what the correct answer is, Wakefield and it is, in fact, Wakefield, right, because there's an inverse relationship between how fast a particle is going and what its wavelength is.
所以，让我们来看看,正确的答案是什么，事实上，答案是，因为粒子运动的快慢,与它的波长之间是一个反比例关系。
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So, if we do this calculation for an electron, saying it moves at 10 to the 5 meters per second, then what we end up with for a wavelength is 7 times 10 to the -9 meters.
如果我们已知电子以，10的5次方每秒的速度运动，那么做一个计算,可以得知它的波长是,7乘以10的负9次方米。
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If this distance is large in comparison to the wavelength, this dam simply casts a shadow.
如果这个距离,比波长更长，水槽中的屏障就会投下阴影。
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What de Broglie is saying we can know the wavelength of any matter at all, as long as we know its mass and it's velocity.
通过德布罗意所说的,只要我们知道了,它的质量和速度，我们可以知道,任何物质的波长。
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They got some number that looks like for the wavelength they got the distance from here to Chicago, and they are going to drag that through the whole calculation.
他们得到一些数,看上去像是波长，他们得到这里,到芝加哥的距离，他们把那个值,用到整个计算中。
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And we want to divide all of that by our wavelength, and to keep our units the same we'll do meters.
我们想用波长除以所有这些，而且保持单位统一我们采用米。
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Just remembering that violet is the end that actually has the shortest wavelength, which means that it also has, of course the highest frequency.
就知道了，所以这应该,不是问题，记住紫色光，最后一个，它的波长最短,也就意味着它的频率最高。
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So that would probably be de Broglie's answer for why, in fact, we're not observing the wavelength behavior of material on a day-to-day life.
所以那就可能是德布罗意关于,为什么我们无法再日常生活中,观测到物质的波动行为的答案。
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So, let's say we're talking about the baseball, have a wavelength of the baseball that's on the order of the baseball.
克服质量的效应，比如说以棒球为例,要棒球的波长有它尺寸数量级的波长。
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