波峰是指横波正交于传递方向上极大值。与之相对的极小值则被称为波谷。因为极小和极大只是取决于正交于传递方向上的坐标方向而言,故两者合称为极值。对于常见的正弦波来说,两者距离平均值零相位)的绝对值相等。对于周期性的传递波(比如正弦波)来说,两者的称为该波的振幅

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