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.
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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.
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.
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.
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:
题目没错,你没有看懂题的英文,真看懂了,就能计算出来其距离。
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.
声学方面的初一物理题,比较难的,
一道大一的高数题,
一道大一的数学题,
给我30道初二上学期的物理题,字数少点,一道一分最好是关于声学和光学的还有物态变化的~
求极限的一道题(很基础)刚刚上大一,感觉高数好难,
一道有趣的物理题!
一道电学的物理题
初三的一道物理题
一道变压器的物理题,
一道大气压的物理题,
一道圆周运动的物理题,
一道物理题,电磁场的,
大一极限求助,很基础的
大一极限的最基础知识点,
有关大一电工基础的题,
只要声学的
和声学的定义?