上页提高振荡电流辐射电磁场的方法1987年赫兹实验 2. 偏振性三电磁波的能量—方向因子动量流密度:在单位时间内通过垂直于传播方向的单位面积的电磁动量 五电磁波谱30000-3000m100-1500kHz电报通信橙紫外线有明显的生理作用 例题11-8 某广播电台的平均辐射功率 假定辐射出来的能流均匀地分布在以电台为中心的半个球面上(1)求在离电台为r =10km处的辐射
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