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 station KFKA started brout+3vz8,tfeji v+ 4u8itv- nyw0,aaus.: jj5f0o+ ;a rpiy.pl+dlzg adcasting 78 years ago at 1.31 MHz on the AM dial. Whaygl:psl;ap +i50jrz. o+d j.ft 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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