SATII (关于声波)A worker hits a metal pipe with a hammer.The ratio of the intensity of loudness as heard by people standing 100 meters away from the worker to the intensity as heard by people standing 200
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声学里有一个这样的结论,P=(P0)/(R^2),此处P0为声波发出时的强度,R指的是距声源的距离.