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These are photodetectors, band gap two electron volts, respond to visible light.
这是光电探测器，能带隙为2电子伏，当它反应于可见光。
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When you want to know if something is transparent to visible light or not, here is the mystery material and here is visible light.
而我们知道,物体是否对可见光透明，这里是神秘的材料，这里是可见光。
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So we talked about what we could see with visible light, we said that's actually the Balmer series.
我们已经说过可见光，它是Balmer系。
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The Morning Star is that heavenly body which is the last heavenly body that's still visible as dawn comes in and it begins to get light.
晨星就是,这样一个天体,它是黎明来临,天快亮时,还能看到的,最后一颗星星
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A sodium chloride crystal is transparent to visible light.
氯化钠晶体对可见光透明。
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And what is going to allow for absorption or some interaction with visible light?
哪些因素会影响吸收,或者与可见光的关系呢？
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What is the E of visible light?
可见光的能量是多少？
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So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.
如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。
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Why is it transparent to visible light?
为什么对可见光透明呢？
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And you have to ask yourself is the energy difference here, the delta E in the electronic states, how does that compare with the E of visible light?
所以我们会问,是由于能量的不同么，例如deltaE在电子能态的不同，那如何把E与可见光联系起来？
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We can plug this in further when we're talking about the visible part of the light spectrum, because we know that for n final equals 2, then that would mean we plug in 2 squared here, so what we get is 1 over 4.
当我们讨论可见光谱的时候,我们可以把这个代进去,因为我们知道n末是等于2的,这意味着我们可以。
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