在电子显微镜下，常使用一束电子光而不是普通光线来为标本照明。

In electron microscopes a beam of electrons instead of a beam of light is directed onto the specimen.

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研究人员发现，一些电子产品在夜间发出的人造光可能会减少大脑中有助于睡眠的化学物质。

Researchers find that man-made light from some electronic products at night may reduce the brain chemicals that help sleep.

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一项研究表明，年龄13至64岁的人群中，约有95%在睡前使用电子产品，特别是年轻人。医生称，电子产品在夜间发出的光可能会让人在睡前感到兴奋。

According to a study, about 95% of the people between the ages of 13 and 64 use electronics before bed, especially the young people. Doctors say that the light from those electronics at night may make you excited before you go to bed.

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The formula tells us or absorbed based on the energy difference between the two levels that we're going between, that the electron is transitioning between.

这些公式告诉我们,或发出的光的，频率大小,是基于，电子转移的，两个能级，之间的能量差。

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And instead of having the electron giving off energy as a photon, instead now the electron is going to take in energy from light and move up to that higher level.

与电子以光子形式施放能量不同,我们现在要从光中,获得能量到一个更高的能级。

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So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是,光从金属表面逐出一个电子,所需的最小频率。

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