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Nomor 3
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Diket :
Jarak awal, r1 = 1 m
Intensitas awal, I1 = 10^-5 watt/m²
Jarak akhir, r2 = 10 m
Intensitas ambang, Io = 10¯¹² watt/m²

Tanya :
Taraf intensitas akhir, TI2 = __?

Jawab :
Step 1
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Cari intensitas akhir, I2 = __?
I2/I1 = (r1/r2)²
I2/(10^-5) = (1/10)²
I2/(10^-5) = (1/10²)
I2 = (1/10²)•(10^-5)
I2 = 10^-7 watt/m²

Step 2
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TI2 = 10 log (I2/Io)
TI2 = 10• log (10^-7)/(10¯¹²)
TI2 = 10• log (10^5)
TI2 = 50 dB


Nomor 4
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Diket :
Jarak awal, r1 = 10 m
Taraf intensitas awal, TI1 = 8 bel = 80 dB
Jarak akhir, r2 = 100 m

Tanya :
Taraf intensitas akhir, TI2 = __?

Jawab :
TI2 = TI1 - 20. Log (r2/r1)
TI2 = 80 - 20. Log (100/10)
TI2 = 80 - 20. Log 10
TI2 = 80 - 20•1
TI2 = 80 - 20
TI2 = 60 desibel
TI2 = 60 dB


Nomor 5
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Seekor lebah, n1 = 1
Taraf intensitas awal, TI1 = 10 dB
Julaeha sumber akhir lebah, n2 = 100 ekor

Tanya :
Taraf intensitas akhir, TI2 = __?

Jawab :
TI2 = TI1 + 10.log (n2/n1)
TI2 = 10 + 10• log (100/1)
TI2 = 10 + 10• log (100)
TI2 = 10 + 10•2
TI2 = 10 + 20
TI2 = 30 dB

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