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You are standing 10 m from a speaker that radiates uniformly in all directions. You then move so that the sound level drops by 15 dB. How far from the speaker are you standing? 

          You are standing 10 m from a speaker that radiates uniformly in all directions. You then move so that the sound level drops by 15 dB. How far from the speaker are you standing?
You are standing 10 m from a speaker that radiates uniformly in all directions. You then move so that the sound level drops by 15 dB. How far from the speaker are you standing?

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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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You are standing 10m from a speaker that radiates uniformly in all directions. You then move so that the sound level drops by 15dB. How far from the speaker are you standing? You are standing 10 m from a speaker that radiates uniformly in all directions. You then move so that the sound level drops by 15 dB. How far from the speaker are you standing?
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Transcript

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00:03 Hello guys, in this problem we have the sound intensity level beta 1 equals 75 decibels at a distance r1 of 2 .4 meters from the speaker.
00:16 The sound intensity level beta 2 equals 6 to 9 decibels.
00:21 We have to find out the distance r2 from the speaker.
00:26 The sound intensity level beta is defined as 10 times log of the intensity i over the threshold density.
00:36 Let's say this has equation...
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