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]
99.25: Pioneering radio stc/is 7 /akv r),a76y:ko, z7z*btfvgdcc8ozzation KFKA started broadcasting 78 yeaq0z-f0e(v,mrpmu re . rs ago at 1.31 MHz on them-pruz,0ve.fre ( 0q m AM dial. What is the approximate length of its radio waves?
A. 23 m
B. 230 m
C. 2300 m
D. 23,000 m
E. $3\times\:10^8m$
参考答案: B
本题详细解析:
暂无
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