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 12.0 m from a c2.joqw*/dqz,pht 5( vk*,gt l roz;f loudspc0-/wowql - 5rg 8cgsreaker, placed in the open, is 105 dB. What is the acoustic posw -c/ocg80rw rq5- lgwer output (W) of the speaker, assuming it radiates equally in all directions?    W

参考答案: 57.2±2%


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