Description
今天描述电磁场的方程被称作⻨克斯⻙方程。很少有人听到过它们，但它们也许是我们知道的在商业上最重要的方程。它们不仅制约从家电到电脑的一切运行，还描述除了光之外的波，诸如微波，射电波，红外光，和 x 射线。所有这些和可⻅光只在一个方面有差别⸺它们的波⻓。射电波的⻓波为一米或更⻓，而可⻅光波⻓为千万分之几米，而 x 射线的波⻓比亿分之一米还短。我们的太阳在所有波⻓上辐射，但是其辐射强度在我们可⻅的波⻓上最大。我们用肉眼能看到的波⻓是太阳最强烈辐射的那些，这也许不是碰巧:很可能是，正是因为这恰好是肉眼获得最大的辐射范围，所以我们的肉眼演化成具有检测该辐射范围的能力。
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