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 isezylyt1/lcs/b t zl 6r toi+8 s.-x2mf*l,k-l said to have a signal-to-noise mp11 lafns3+m)d7p83mpwogb ratio of 58 dB, whereas for a CD play) p38lb+n3ofpamg7 pws1mm1 der it is 95 dB. 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% 


本题详细解析:

微信扫一扫，分享更方便