taraf intensitas 100 db jika satu sumber bunyi intensitasnya 10-6 w/m2 tentukan berapa banyak sumber bunyi tersebut?

BUNYI
• I dan TI

I₀ = 10⁻¹² W/m²
I₁ = 10⁻⁶ W/m²
Tiₙ = 100 dB
n = ___?

Intensitas n sumber bunyi
Tiₙ = 10 log (Iₙ / I₀)
100 = 10 log (Iₙ / I₀)
10 = log (Iₙ / I₀)
(Iₙ / I₀) = 10¹⁰
Iₙ = 10¹⁰ I₀
Iₙ = 10¹⁰ • 10⁻¹²
Iₙ = 10⁻² W/m²

Jumlah sumber bunyi
Iₙ = n • I₁
10⁻² = n • 10⁻⁶
n = 10⁴ buah sumber ← jwb

diketahui :
TI = 100 db
 i = 10⁻⁶ w/m²

tanya : banyak sumber bunyi ?

jawab :

TI = 10 Log i / i₀
TI = 10 log 10⁻⁶ / 10⁻¹²
TI = 10 log 10⁻⁴⁻⁽⁻¹²⁾
TI= 10 Log 10⁸
TI = 10 (8)
TI = 80 db

TI = Ti1 + 10 Log n
100 = 80 + 10 log n
100 - 80 = 10 log n
20 = 10 log n
20/10 = log n
2 = log n
10² = log n
n = 100
banyak nya sumber bunyi ada 100