gc textbook chapter 12 Sound (id: 691c6bc2f)

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]
The predominant frequec 49z8j6wtr6 jlfpmb+ncy of a certain fircfq2jv(x/ l e2e engine’s siren is 1550 Hz when at rest. What frequency do you detect if you move wec(fq /2j lv2xith a speed of 30 m/s
(a) toward the fire engine,    Hz
(b) away from it?   Hz

参考答案:
空格1: 1690±2%  空格2: 1410±2% 


本题详细解析:

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