31) Given the intensity level at 15 meters, we want to find what happens to the intensity level when the speaker is moved to 2 meters. Make sure to note we are not talking about the intensity, but rather the sound level, which is traditionally approximated with this logarithmic scale.
Using this equation, we can find the sound intensity at 15 meters.
Next, knowing that intensity is inversely related to area, we can find the intensity at 2 meters.
Finally, if we plug this back into our sound level equation, we can find the intensity level.
Answer: E
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