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Also to point out, a lot of times you'll see electron volts instead of joules, this is the conversion factor here just so you all have it in your notes.
同样也要指出，很多情况下你会看到,电子伏特而不是焦耳，这里是换算因子,你们在讲义上都能找到。
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What people did is they said let's define a unit of energy that represents a unit charge accelerated across a unit potential difference, and let's call that the electron volt.
前人们所做的就是他们说让我们确定,一个能量单位用来代表一单位电荷,加速穿过形成的一单位电势差，我们叫它电子伏特。
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Now you can see 2.18 times 10 to the minus 18 joules can be 13.6 eV.
你可以看到,2。18乘10到负18焦耳,得到13。6电子伏特。
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So I am going to go and I am going to look for something that has an energy of 13.6 electron volts holding it in place, and I am going to use a flashlight with 12,400 electron volts.
所以我将去,找一些东西,有13。6电子伏特的东西,将它固定在某个地方,我要利用12。400电子伏特的电子源。
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Or, in my favorite unit, 19.80 electron volts.
或者用我最喜欢的单位，就是19。80电子伏特。
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This will be 13.6 over 100 electron volts.
这相当于13。6倍的100电子伏特。
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If I take lambda equals one angstrom, hc/lambda go through hc over lambda, you will discover that the energy of a photon with one angstrom as its wavelength is on the order of 12,400 electron volts.
如果我让波长等于一埃，能量为，你将发现光子的能量,当其波长为1埃的时候,相当于12，400电子伏特。
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It is up around 13, 14, 15 electron volts.
它最高大约为13，14，15电子伏特。
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The electron volt is not a unit of potential difference.
电子伏特不是,就是一单位的电子伏特。
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It is 13.6 electron volts.
它有13。6电子伏特。
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That is one electron volt.
就是一单位的电子伏特。
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This is electron volts per atom.
这是每个原子所具有的电子伏特。
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