# Speakers sound level at a certain point.

#### Lipd

Nevermind, I was able to solve it.
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Two small speakers emit spherical sound waves of different frequencies. Speaker A has an output of 1.00 mW and speaker B has an output of 1.50 mW. Determine the sound level (in decibels) at point C if a) only speaker A emits sound, b)only speaker B emits sound, c) both speakers emit sound.
The attachment has the distances and arrangement of the speakers and the point c.
Any help is much appreciated, thanks!

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#### HallsofIvy

Science Advisor
Homework Helper
The "1.00 Mw" and "1.5 Mw" tell you the strength. Like anything else that expands "spherically", sound obeys an inverse square law.
The intensity of the sound is S/r2 where S is the strength of the sound and r is the distance from the point to the speaker. You will have to calculate that for each speaker and then add.

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