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OpenStudy (anonymous):
A source of sound of constant power P is situated in an open space. The intensity I of sound at distance r from this source is given by I = (P) / (4πr^2) How does the amplitude a of the vibrating air molecules vary with the distance r from the source? A a ∝ 1/r B a ∝ 1/r^2 C a ∝ r D a ∝ r^2
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