18. Waves & Sound
Wave Intensity
3:47 minutes
Problem 15c
Textbook Question
Textbook QuestionThreshold of Pain. You are investigating the report of a UFO landing in an isolated portion of New Mexico, and you encounter a strange object that is radiating sound waves uniformly in all directions. Assume that the sound comes from a point source and that you can ignore reflections. You are slowly walking toward the source. When you are 7.5 m from it, you measure its intensity to be 0.11 W/m^2. An intensity of 1.0 W/m^2 is often used as the 'threshold of pain.' How much closer to the source can you move before the sound intensity reaches this threshold?
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