本题目来源于试卷: Physics Unit12: Sound，类别为 国际高中通用物理
[单选题]
At a distance of 15 5 huy vmrf3jfe**ax58 m :f2ry s;wkoiw/wo ze1b +u4(o from a sound source the intensity level is 60 dB. What is the intensity level (in dB) atr2 ;ky(wf/u wbo14ow+o:esz i a point 2.0 m from the source? Assume that the source radiates equally in all directions.
A. $55.7 \; dB$
B. $57.5 \; dB$
C. $75.5 \; dB$
D. $77.5 \; dB$
参考答案: D
本题详细解析:
暂无
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