Physics Unit12: Sound (id: 41966e554)

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]
You are moving at 120 km/h toward a stationary traiem* pu7sbp ;dq)6 e*jpn. The train blojt9m0czvfk2;6 r 7+wa ewbff9ws its 400-Hz whistle. Take the speed of sound to be 340 m/s0w crftz6jm efk279;vba+9 wf. What frequency do you hear?

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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