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 trajwg 09wajs x8aq5;(icn7kmg 5 zx5gkh g06uu;4j7lt dw9el *tin horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observe u; jle0thd96x7kzl5*w g4gtur 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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