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No. 27
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Diket :
Daya bunyi, P = 80 watt

Tanya :
A. Intensitas pada jarak, r = 3 m
I = P/A
I = P/(4π.r²)
I = 80/(4π•3²)
I = 80/(36π)
I = 20/(9π) watt/m²
I = 0,7077 watt/m²

B. Jarak, r2 = __?
Agar TI2 = 80 dB

Step 1
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Cari dulu taraf intensitas pada jarak, r1 = 3 m
TI1 = 10.log (I/Io)
TI1 = 10.log (0,7077/10¯¹²)
TI1 = 10.log (0,7077•10¹²)
TI1 = 120 + 10.log 0,7077
TI1 = 120 - 1,5
TI1 = 118,5 dB

Step 2
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TI2 = TI1 - 20.log (r2/r1)
80 = 118,5 - 20.log (r2/3)
20.log (r2/3) = 118,5 - 80
20.log (r2/3) = 38,5
Log (r2/r1) = 38,5/20
Log (r2/3) = 1,925
Log (r2/3) = log 10^1,925
(r2/3) = 10^1,925
(r2/3) = 84,1395
r2 = 3 x 84,1395
r2 = 252,4185 meter

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