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A worker hits a metal pipe with a hammer .The ratio of the i

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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________
.........本题为计算题.........
以两个半径分别为100米和200米的球的表面积之比,应为4:1