在接收终端，分离出不同颜色的光的传统方法在这里是行不通的。
At the receiving end, traditional methods to separate the different colours will not work.
1900年，普朗克根据实验的观察推论出，一个受热的物体在放出某种频率(或颜色)的光时，是以称为量子的不连续量放射。
Based on observations, Planck in 1900 figured that a heated body releases light of a given frequency, or color, in discrete amounts called quanta.
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