Physics Unit12: Sound (id: a183251a8)

本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理

[单选题]
Sonar is used to determine the speed of an object. yrp : k5hu5/*6voqyntA 40-kHz signal is s5g:moltnz+2 ou bd.0m ent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast i.2m o:glz5m ontb0ud+s the object moving?

A. 6.9 m/s
B. 8.4 m/s
C. 331 m/s
D. 347 m/s


参考答案:  B


本题详细解析: 暂无

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