本题目来源于试卷: Wave-EM Wave，类别为 美国物理杯赛(Physics Bowl)
[单选题]
An electromagnetic wave has auba:t py7v 3ca rfsht.3 :gvbl,+gd2 :nq0*fbqs6x4k2(8g hy,sesvi p*;b sh p electric field given by the expression (in Cartesian coordinates) qf 4* ks,qb(2hhy6x *gse8sp p;v0bis:
$\overrightarrow{E}(x,t)\:=\:6.0cos(1.14\times\:10^7x-3.34\times\:10^{15}t)\overrightarrow{z}$
09.48: What is the direction of the energy flow for the wave?
A. −x
B. + x
C. −y
D. +y
E. +z
参考答案: B
本题详细解析:
暂无
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