本题目来源于试卷: Physics Unit12: Sound,类别为 通用国际物理
[单选题]
The frequency of a tyd+)wss2k zq0qo:28 gmck )cwujr31k rain hsodyow )w ; )h3dsxdmz)4w6s/ orn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is mo6zw;sm 4w)od3xdsd)y)/ w soh ving 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:
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