电磁波矢量沿一特定方向传播(假设为+Z)方向传播,则电场矢量和磁场矢量在垂直于+Z方向的平面(横截面)上随时间的变化而表现一定的
回答: 物理数学相对论01 电子的电势能的绝对值等于动能的2倍. 但当 时,可舍去高次项 中仅含两项,一项为经典动能,另一项代表什么?
由 marketreflections
于 2011-03-03 11:16:07
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