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If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.
如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。
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And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.
这只是牛顿学上关于动量的表达，用电子质量,乘以瞬时速度。
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I mean they take up a teeny bit but essentially when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass we're discussing.
所以我们可以假设电子没有质量,它们占据了，非常小的一部分,所以当我们考虑,原子的构造的时候,不用考虑它们的质量。
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If you look at the electrical force, the force of electricity, proton and electron or something, it's not proportional to the mass of either object.
如果你考察电作用力,即电现象产生的力,质子啊,电子啊,或者其它什么东西,这种力不和物体的质量成比例
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If a photon which has no mass can behave as a particle, does it follow then an electron which has mass can behave as a wave? 1920.
如果一个没有质量的光子,能像粒子一样运动，那么它能像一个,没有质量的电子那样以波的形式运动吗。
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The number of electrons in an atom is deduced to be approximately equal to half the atomic weight.
原子中的电子数,将近是原子质量的一般。
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e We also have e, which is going to be the charge on the electron.
这是电子的质量，我们还有。
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That is why we don't worry about the motion of the nucleus 1 because the ratio of mass is about 2,000 to one.
这就解释了为什么我们不担心,原子核运动起来,因为原子核和电子的质量比约为2000：
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We figured out the mass is so tiny that it shouldn't really deflect them very much.
电子的质量这么小,对它基本不会产生影响。
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And we don't put the mass of the electrons because they are so light in comparison.
我们不能得到电子的质量,因为它们相较起来太轻了。
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I mean, the atom has a tiny mass, too, but what we are saying is compared to the totaled atomic mass, the mass of the electron is tiny.
我的意思是，原子的质量也很小，但是我们说的是,和整个原子质量相比，电子的质量是很小的。
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If a proton which has no mass can behave as a particle does it follow that an electron which has mass can behave as a wave?
如果一个没质量的光子能像粒子一样,具有质量的电子能否,表现得像波一样吗？
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Furthermore, the electron has a very tiny mass in comparison to that of the overall atom.
进一步，电子的质量很小,相比于整个原子。
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We can make some substitutions here using some of the derivation on the previous board which will give us the Planck constant divided by 2 pi mass of the electron times the Bohr radius.
在这里我们也可以,用我以前在黑板上写过的一些词来取代它,得到的是普朗克常数除以2π电子质量,再乘以波尔半径。
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1*10^-31kg This is 9.11 times 10 to the minus 31 kilograms.
若电子质量为9。
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He goes back and redoes the calculation, only in this case he says what I am going to do is I am going to redo the calculation for helium, but I am going to consider not just the mass of the electron but the reduced mass of the system.
他回去重新做了计算，仅在这种情况下他才会说说我将要,为氦重做计算，但我认为,不只是电子的质量,还有系统质量的减少量。
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Square of the Planck constant times pi mass of the electron.
普朗克常量的平方,乘以π再乘电子的质量。
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But its mass is 1800 times that of the electron.
但是它的质量是电子的1800倍。
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It is the mass of the electron.
它指电子的质量。
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If you look up really close, there is the elementary charge e.There is the mass of the electron.
如果你仔细找的话，会找到e表示的元电荷,也能找到电子的质量。
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This is going to have one-half mv squared where this is the mass of the electron.
有了电子的质量,就可以用1/2mv^2算出其动能。
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Again, m is the mass of the electron.
其中，m是指电子的质量。
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