本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理
[单选题]
A train is traveling aoor:us/n 7 9ga1a4 fyu*tzh(u4 7 22m jjf 0voi;wvcndway from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency 0d7* jyi jfvtf4(wn24vuu;oa1h2z mcof the whistle?
A. $444 \; Hz$
B. $439 \; Hz$
C. $364 \; Hz$
D. $361 \; Hz$
参考答案: B
本题详细解析:
暂无
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