Inverse Square Law

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I had a question regarding a sound with a given Intensity and a given radius (say 0.1m from point source) for that intensity that travels through a door with dimensions given as well. It was gives a second radius (say 30m from point source) asking what the acoustic power was at a second radius after travelling through the door.

I know I am using the inverse square law to relate the second intensity, but how do I figure the door into the question?

Im sorry I cant give the exact question, it was in a quiz and I dont have any similar examples with me. Im trying to remember the question off the top of my head.

Any help would be excellent.

Regards,
Julie
 
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