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As the people sing in church, the sound level everywhereinside is 101 dB. No sound is

ISBN: 9781305116405 466

Solution for problem 28 Chapter 17

Physics for Scientists and Engineers, Volume 1, Technology Update | 9th Edition

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Physics for Scientists and Engineers, Volume 1, Technology Update | 9th Edition

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Problem 28

As the people sing in church, the sound level everywhereinside is 101 dB. No sound is transmitted throughthe massive walls, but all the windows and doorsare open on a summer morning. Their total area is22.0 m2. (a) How much sound energy is radiatedthrough the windows and doors in 20.0 min? (b) Supposethe ground is a good reflector and sound radiatesfrom the church uniformly in all horizontal andupward directions. Find the sound level 1.00 km away.

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Day 18 ­ 2/17/2016 Phys 5b Midterms Back ­ anyone with a score above 45 is in the running for an A ­ that does not mean that if you have a 30 in the exam, then you have a chance ­ provided that you show improvement ­ she is interested in detailed steps ­ she will drop the 1c) problem points...

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