gc textbook chapter 12 Sound (id: d346608c6)

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]
In audio and communicat *mj q;+/nn5 xy.*yvswqwez/e8l7ea b3/mkaqions syhzb2 t k;bx)g(stems, the gain, $\beta$ in decibels is defined as
$\beta$ = 10log($\frac{P_{out}}{P_{in}}$)
where $P_{in}$ is the power input to the system and $P_{out}$ is the power output. A particular stereo amplifier puts out 100 W of power for an input of 1 mW. What is its gain in dB?   dB

参考答案: 50±2%


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