H2P-271
Inverse square law
H2 Physics · JC 1 · Medium · Inverse square law
A point source of sound produces an intensity of 2.0×10⁻⁶ W m⁻² at 5.0 m. At this point, the amplitude of vibration of air molecules is 20 μm. What is the amplitude at 15 m from the source?
- 6.7 μm
- 1.3 μm
- 60 μm
- 180 μm
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