How is sound pressure P (N/m2) related to intensity I (W/m2) ?
When sound PRESSURE P doubles,
sound INTENSITY I quadrupes: I is proportional to P2
can use relation to calculate relative sound pressure P2/P1
To calculate absolute sound pressure one uses P0 = 2x10-5 N/m2
example: if f (forte) = 70dB, find sound pressure (Answ: 0.06N/m2)
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