电磁波是由同方向且互相垂直的电场与磁场在空间中衍生发射的震荡粒子波,是一种以波动的形式传递的电磁场,具有波粒二象性。由同相振荡且互相垂直的电场与磁场在空间中以波的形式移动,其传递方向垂直于电场与磁场产生的平面。电磁波在真空中速率固定,速度为光速。见麦克斯韦方程组。
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