gc textbook chapter 12 Sound (id: 835966964)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理

[填空题]
Two trains emit 424-Hz whistles. One024 ,tf/uh iqy2 vowlq train is station lz*2;x ao szlb,z6h+x b4ms1eary. The conductor on the stationary train hears a 3.0-Hz beat frequency when the other t 6,1+*ezlzol mx;42bas h zxbsrain approaches. What is the speed of the moving train?   m/s

参考答案: 2.41±2%


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