Physics Unit22: Electromagnetic Waves (id: 6ed701cfe)

本题目来源于试卷: Physics Unit22: Electromagnetic Waves，类别为 通用国际物理

[单选题]
In a vacuum, the velocity dvpzy;*ns w 9jc - 0*ry7.yggbof all electros 8hkv dme 1cnsxi;117e w.kk,magnetic waves

A. is zero.
B. is nearly $3 \times 10^{8} \; m/s$.
C. depends on the frequency.
D. depends on their amplitude.


参考答案:  B


本题详细解析: 暂无

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