一道美国大一声学的物理题挺基础的
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一道美国大一声学的物理题挺基础的
For a speaker whose sound power output is 140 dB,the distance from the speaker at which the sound level will be reduced to 96 dB is ___m.
For a speaker whose sound power output is 140 dB,the distance from the speaker at which the sound level will be reduced to 96 dB is ___m.
你确定题目没有问题吗?我觉得这句话( sound power output is 140 dB)显然不对,因为要有了140dB时的距离这道题才有意义,它应该给出的是声源辐射出的能量.
给你一点有关decibel的资料吧:
给你一点有关decibel的资料吧: