本题目来源于试卷: Wave Intensity and Decibel，类别为 美国物理杯赛(Physics Bowl)
[单选题]
00.31: The average signal to noise ratio for a partiid4sb7np cd .*crk( 2mb/(t abcular mo8.2 c/yptrd tape recorder is 50 decibels. This means that the loudnessrp2. odtm yc/8 of an average reproduced signal is about how many times louder than the loudness of the tape noise?
A. 7.07 times
B. 50 times
C. 625 times
D. 2500 times
E. 100,000 times
参考答案: E
本题详细解析:
暂无
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