SAT2物理

来源：百度知道 编辑：UC知道 时间：2024/06/16 18:49:50
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 meters away from the worker is
(A)4:1
(B)2:1
(C)1:1
(D)1:2
(E)1:4
希望不要只给个答案，最好给一下公式

A
声音是向四面八方传播的，基其能量是在一个以worker为中心的球上分布的。所以啊，响度就可以这样来比拟E/(4π*R^2)。所以响度是与听的人worker的距离的平方成反比的。