SATII (关于声波)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 A 4:1B 2:1

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SATII (关于声波)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 A 4:1B 2:1
SATII (关于声波)
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
A 4:1
B 2:1
C 1:1
D 1:2
E 1:4
：A 请问有类似的公式什么的吗?

SATII (关于声波)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 A 4:1B 2:1
声学里有一个这样的结论,P=(P0)/(R^2),此处P0为声波发出时的强度,R指的是距声源的距离.

SATII (关于声波)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 A 4:1B 2:1 翻译(a social worker) worker a worker in factory 还是a worker in a factory 看下面 I am a worker 对a worker提问 Miss Liu is a worker.(对a worker提问) Bob's father is a worker.(对a worker提问) I'm a worker 特殊疑问句a worker 画线 Mr Chen is a worker. 关于声波和电磁波,下列哪些说法是对的?A.声波可以被反射,电磁波不会.B.声波不可能对人体产生危害.C.声波和电磁波都可能产生环境污染 my brother is a worker对worker进行提问 I am worker 为什么要在worker前加a? 英语辩论关于To be a boss Or to be a worker我是正方,观点是to be a boss 写150字的英文,关于difference of being a student and a worker不用写太好,字数要够. The worker put in a bag.改错 his father is a worker. 的问句 Neither of them (be) a worker a factory worker的复数是什么