gc textbook chapter 12 Sound (id: b23d7cbfd)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 IB物理学

[填空题]
The frequency of a steam train whistl+wo 3-y +sas5b hyt6fze as it approaches you is 538 Hz. After it,mijyjdaop +4z;zm ge *6 /.hc passes you, its frequency is measured as 486 Hz. How fast was the train moving (assume constant velocity) dhzj*+;a.4ocjmp/ig,e m y6z?    m/s

参考答案: 17±2%


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