gc textbook chapter 12 Sound (id: 223756b40)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 IB物理学

[填空题]
A single mosquito 5.0 m from a person makes a soupume6nc 1sds)1 gp1b4be71dgnd closy0np r9/ //aaydqtcz*e to the threshold of hu/9*nc aprt0yq/y/a dzman hearing (0 dB). What will be the sound level of 1000 such mosquitoes?    dB

参考答案: 30±2%


本题详细解析:

微信扫一扫，分享更方便