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"Essentially,The Particle Adventure is an interactive tour of the world of quarks, neutrinos,antimatter, extra dimensions,dark matter, Higgs boson, as well as accelerators and particle detectors."
VOA: standard.2010.03.05
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I have shown you yesterday that the speed of the particle as it goes around the circle is this .
我昨天讲过,质点做圆周运动的速率等于这个
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The answer is that simply knowing the particle has an acceleration is not enough to tell you where the particle will be.
答案是这样的,仅仅知道质点的加速度,是不足以告诉你它接下来的运动的
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The group's recent "State of the Air" report said Pittsburgh has the worst short-term fine particle pollution in the country.
VOA: special.2009.07.13
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So, remember this makes sense if you just think of it as a wave and forget the particle part of it for right now, because that would be very upsetting to think about and that's not, in fact, what's going on, we're talking about quantum mechanics here.
记住如果你们把它看做是一个波,而忘记它是一个粒子时，这就是可以理解的了，因为如果把它看做,一个粒子就行不通了，实际上也不是这样的，这里我们是以量子力学的角度来考虑问题。
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When a light particle,or photon, hits an electron, the electron jumps to a higher energy state.
VOA: special.2010.09.01
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And since we are not expecting the mass of the particle to change, what we really are saying is the uncertainty in its velocity times the uncertainty in its position is greater than the ratio of the Planck constant divided by 2 pi.
因为我们不期望,粒子质量发生变化，我们说的是,它速度的不确定度,乘以它位置的不确定度,比普朗克常量,除以2除以圆周率要大。
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The Large Hadron Collider, of course,is the world's largest particle accelerator located near Geneva.
VOA: standard.2010.03.05
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They can click on the particle and move it around in this 3D space.
学生可以在物质上点一下,然后让它动起来,在这个3D空间里。
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For a free and highly readable introduction to the world of particle physics available in 15 languages as well as English transport yourself to particleadventure.org, or visit our site,VOAnews.com, for the link to this and hundredsof other Websites of the Week.
VOA: standard.2010.03.05
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If all you know is the particle is falling under the affect of gravity, that's not enough to say where the particle is, right?
如果你只知道,质点受重力作用下落,那并不足以表明物体的位移,对吧
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but you can sort of tell that the particle is moving slowly or rapidly by looking at the space in between these tick marks.
但你可以通过观察计时点之间的距离,来判断该物体运动的快慢
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Suppose the particle is not moving in a circle, but does this.
假设这个质点不是做圆周运动,而是这样
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He could divide all of that by the absolute value of the charge of the positive particle, all over the mass of the positive particle.
他可以把这整个,除以正电粒子的,电荷绝对值除以，正电粒子的质量。
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A clock tells you what time it is, but you can also say what time it is by seeing how fast the particle is moving because you know it started with some speed.
时钟能告诉你现在的时间,但你也可以通过测量质点速度,来判断当前的时间,因为你知道它的初速度
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It's the actual motion of the particle.
这是质点的实际运动路线
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You're only given the particle has acceleration a, and you are asked to find out what is x?
你只知道质点的加速度为a,你需要求出x是多少
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So this validates de Broglie and it also validates the whole concept of wave-particle duality.
这就证实了德布罗意的观点,也证实了,波粒二象性的原理。
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If de Broglie is correct, we could then model the electron in its orbit not moving as a particle, but let's model it as a wave.
如果德布罗意是对的，那么我们可以在电子轨道中建立电子模型,不是像粒子一样运动，而是像波一样运动。
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So you're basically having a wave equation for a particle, and for our purposes we're talking about a very particular particle. What we're interested in is the electron.
所以你们主要有,一个粒子的波动方程，我们的目的是考虑一个特殊的粒子,我们感兴趣的是电子。
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As time increases, the angle increases and we can ask, "How long does it take for the particle to come back to the starting point?"
这个角度随着时间在增加,我们会问,"质点需要多长时间,才能转到起点"
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The other two you know are stuff you can add, and you know where you're adding those things, because the particle has a head start.
另外两项是可加可不加的,而且你也知道这两项是怎么来的,因为质点运动是有起点的
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The particle is moving along this arc.
物体沿着这条曲线运动
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So what I'm saying here is we are specializing to a limited class of motion where the particle has a definite acceleration, a.
我在这里想说的是,我们正在专门讨论一类问题,这些问题中,质点都有一个确定的加速度a
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The answer was: at any time t, the location of the particle is given by this formula.
答案是,在任意时刻 t,这个质点的位移都由这个式子给出
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As t increases, this angle increases and the particle goes round and round.
随着 t 的增加,这个角度也在增大,这个质点不停地转圈
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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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And there is no way to explain this phenomenon if you model the water as having particle-like properties.
没有其他的方法来解释这种现象,除非认为,水是一种具有粒子的性质。
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So, it turns out that the photoelectric effect is not the only evidence for the fact that light has these particle-like characteristics.
所以，原来是光电效应,不是唯一的证明光具有,粒子特性的证据。
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But before we get to that, in terms of thinking just think, OK, this is representing my particle, this is representing my electron that's what the wave function is.
但是在我们谈论那个部分之前，在理解方面，仅仅是理解，好的，它代表了粒子，它代表了电子,这就是波函数。
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