一道SAT2物理A worker hits a metal pipe with a hammer.The ratio o
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一道SAT2物理
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 work is
A 4:1 B 2:1 C 1:1 D 1:2 E 1:4
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 work is
A 4:1 B 2:1 C 1:1 D 1:2 E 1:4
A.consider the sound source as a point source,and the sound wave the hammer emits as a spherical wave,then the sound intensity at r is proportional to 1/(r^2) because of the energy conservation.
SAT2物理A worker hits a metal pipe with a hammer.The ratio of
A worker hits a metal pipe with a hammer .The ratio of the i
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