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]
00.07: The length of the motf c-bm u+1 1wnmah3p7st effective transmitting antenna is equal to ;yvp5ew em 28rone-fourth the wavv8y me2;p5wre elength of the broadcast wave. If a radio station has an antenna 4.5 meters long then what is the broadcast frequency of the radio station?
A. $1.5\times\:10^{-8}Hz$
B. $6.0\times\:10^{-8}Hz$
C. $1.7\times\:10^7Hz$
D. $6.7\times\:10^7Hz$
E. $3.0\times\:10^8Hz$
参考答案: C
本题详细解析:
暂无
| 
