gc textbook chapter 12 Sound (id: cdc564d94)

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]
Workers around jet aqd.f+wy,c(ur .r usdlg- mr wzxct1 ;.*, (ygs)e-qxfircraft typically wear protective devices over their ears. Ass.*-,.rym w) sge1z(r;qdf xxs-uc lt gume that the sound level of a jet airplane engine, at a distance of 30 m, is 140 dB, and that the average human ear has an effective radius of 2.0 cm. What would be the power intercepted by an unprotected ear at a distance of 30 m from a jet airplane engine?    W

参考答案: 0.13±2%


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