1 . 声强是指声音在传播途径上每平方米面积上声能流密度,用
表示,人类能听到的声能流范围很广,其中能听见的
声音的声强(约为
)为标准声强,记作
,声强
与标准声强
之比的常用对数作声强的声强级,记
,即
,声强级
的单位名称为贝尔,符号为
,取贝尔的十倍作为响度的单位,称为分贝尔,简称分贝(
).《三国演义》中有张飞喝断当阳桥的故事,设张飞大喝一声的响度为
,一个士兵大喝一声的响度为
,如果一群士兵同时大喝一声相当于张飞大喝一声的响度,那么这群士兵的人数约为( )
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