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 aircrafte2tboku,zh- .t. k2da typically wear p 7qo8020tb(g knquu-srv,w (ats- ppdrotective devices over their ears. Assume 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 c su 0(-dvqtk-0p7ar s8(opubw,t qn2gm. 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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