Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 27 m away from the sound source is 3.0 × 10 − 4 W m 2 . What is the intensity at a spot that is 87 m away?

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Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 27 m away from the sound source is   3.0  ×  10  −  4      W          m              2            . What is the intensity at a spot that is 87 m away?

garcialdariamcy4q · Accepted Answer

I have assumed that the inverse square law is followed here:  I  ∞      1          d              2              ∴  I  =      k          d              2            For the 1st case we can write:      I          1        =      k          27              2              ∴  k  =  3  ×      10          −      4        ×      27          2        =  0.2187  WFor the 2nd case:      I          2        =      k          87              2              =      0.2187    7569        I          2        =  2.89  ×      10          −      5        W      /        m          2

Suppose that a public address system emits sound uniformly in all directions and that there are no r

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