gc textbook chapter 12 Sound (id: b311a5bf1)

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 sound level 12.01cw) y2s hnwy/h.x. ux m w5y mp5b1-pql from a loudspeaker, placed in the open, is 105 dB. What is the acoustic power output (W) of 5blp5m1 qy- wpthe speaker, assuming it radiates equally in all directions?    W

参考答案: 57.2±2%


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