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A loudspeaker is placed between two observers who are 120 m apart, along the line connecting them. If one observer records a sound level of 60.0 dB and the other records a sound level of 90 dB, how far is the speaker from each observer? (Hint: use the equation given in problem 17.28, page 538 which relates the difference between the decibel levels to the distances from the source.)
a. 3.7,116.3
b. 4.3,115.7
c. 6.2,113.8
d. 8.6,111.4

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It finds the distance between the speak and observer by given the sound level.

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