本题目来源于试卷: Physics Unit12: Sound，类别为 国际高中通用物理
[单选题]
The frequency of a train horn is 500 Hz. Assume the speed of so1wp/+x ecv g bgmb42w1bz)ih3und i1h 6f6 cuq::i/ tcqbzun air is 340 m/s. What is thf 61ui6z:/ qbtcqh:u ce frequency heard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?
A. $500 \; Hz$
B. $456 \; Hz$
C. $548 \; Hz$
D. none of the above
参考答案: B
本题详细解析:
暂无
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