SOUND

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A POINT SOURCE IS EMITTING SOUND IN ALL DIRECTIONS.FIND THE RATIO OF DISTANCE OF TWO POINTS FROM THE POINT SOURCE WHERE THE DIFFRERENCE IN SOUND LEVELS IS 3 db
A)2 B)3 C)0.5 D)âˆš0.5

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Harry Potter ·2009-01-27 11:44:41

c i think so

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iitimcomin ·2009-02-18 05:39:58

I/4piR^2 = I1(AT POINT R FRM SOURCE) ...................................
ln(I2/I0) - ln(I1/I0) = 0.3 .......................
ln(I2/I1) = 0.3 ...............
2ln(R1/R2) = 0.3 ....................................
ln(R1/R2) = 0.3/2 ..............................
use log tables!!!!

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SOUND

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