1.      Taraf intensitas bunyi (TI) pada suatu jendela terbuka yang luasnya 3 m2 adalah 180 db. Jika harga ambang bunyi 10-16 watt/cm2, maka daya akustik yang m

A = 3 m² = 30000 cm²
TI = 180 dB
I0 = 10^(-16) I0 ---> tulisannya I nol

TI = 10 Log (I/I0)
180 = 10 Log (I/10^(-16))
18 = Log (I × 10^16)
10^18 = I × 10^16
I = 10^2
I = 100 Watt/Cm²

P = I×A
= 100 × 30000
= 3000000 Watt
= 3 MWatt

BUNYI
• TI

TI = 180 dB
A = 3 m²
I₀ = 10⁻¹⁶ W/cm² = 10⁻¹² W/m²
P = __?

Intensitas bunyi
TI = 10 log (I / I₀)
TI = 10 log (I / 10⁻¹²)
180 = 10 log (I / 10⁻¹²)
18 = log (I / 10⁻¹²)
I / 10⁻¹² = 10¹⁸
I = 10⁶ W/m²

Daya bunyi
I = P / A
P = I A
P = 10⁶ • 3
P = 3×10⁶ W ✓