来自《耶鲁大学开放课程：新生有机化学 第7集 第7集》

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  It's a2 times the same thing. Okay? So again,
  动能是原来的a平方倍
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  the potential energy is constant. Right?
  但势能还是不变的
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  It doesn't change with position.
  它并不随位置而变化
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  But what is different?
  但什么不同了
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  It has higher kinetic energy if it's a shorter wavelength.
  短波长引起高动能
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  And notice that the kinetic energy is proportional
  另外要注意动能
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  to one over the wavelength squared, right?;
  是与波长平方的倒数成正比的
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  a2; a shortens the wave, it's proportional to a2,
  a平方使得波长变短所以与a平方成正比
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  one over the wavelength squared.
  与波长平方的倒数成正比
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  Okay. Now let's take another function, exponential,
  接下来考察另一个函数 指数函数
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  so ex. What's the second derivative of ex?
  比如自然指数函数 其二阶导数是什么
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  Pardon me?
  是什么