P18_022 - = 10 log 8 . 84 10 9 W / m 2 1 . 00 10 12 W / m 2...

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22. (a) The intensity is given by I = P/ 4 πr 2 when the source is “point-like.” Therefore, at r =3 . 00 m, I = 1 . 00 × 10 6 W 4 π (3 . 00 m) 2 =8 . 84 × 10 9 W / m 2 . (b) The sound level there is
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Unformatted text preview: = 10 log 8 . 84 10 9 W / m 2 1 . 00 10 12 W / m 2 = 39 . 5 dB ....
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