gc textbook chapter 12 Sound (id: 93c685af6)

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]
A cassette player is said to have a signal-to-noismod : mgyqc+.9e ratio o+a8dii *cqh7ft (1hbk f 58 dB, whereas for a CD player it is 95 dfitda i1hbk( 8 q*+7chB. What is the ratio of intensities of the signal and the background noise for each device? 58 dB =    $ \times10^{ 5}$ dB =    $ \times10^{9 }$

参考答案:
空格1: 6.3±2%  空格2: 3.2±2% 


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