Homework Help: Physics

Posted by Jena on Tuesday, December 5, 2006 at 9:46pm.

This time I have two questions:
#1.A recording engineer works in a soundproofed room that is 49.7 dB quieter than the outside. If the sound intensity in the room is 2.66 x 10-10 W/m2, what is the intensity outside?

#2.A listener increases his distance from a sound source by a factor of 3.86. Assuming that the source emits sound uniformly in all directions, what is the change in the sound intensity level?

can i plz get some help?

2: Change in intensity level= 1/3.86^2
Now if you want it in db, it is -10log 1/3.86 db or 5.86 db less intense.

1: 49.7 = 10log (I/Io)

I/Io= 10^4.97
I= 2.66 x E-10 * 9.33E4

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