An omnidirectional loudspeaker emits sound uniformly in all directions. The amplitude of the sound waves is 18 μm18\text{ }\mu\text{m}18 μm at a distance of 2.0 m from the loudspeaker.
What is the amplitude of the sound waves at a distance of 6.0 m from the loudspeaker?
2.0 μm2.0\text{ }\mu\text{m}2.0 μm
6.0 μm6.0\text{ }\mu\text{m}6.0 μm
10 μm10\text{ }\mu\text{m}10 μm
18 μm18\text{ }\mu\text{m}18 μm
