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I₁ = 1,6 x 10⁻⁴ W/m²
r₂ = 10 m
I₂ = ..........?
Penyelesaian :
I = P/A
P₁ = P₂
I₁ • A₁ = I₂ • A₂
I₁ • πr₁² = I₂ • πr₂²
I₁ • r₁² = I₂ • r₂²
1,6 x 10⁻⁴ • 4² = I₂ • 10²
1,6 x 10⁻⁴ • 16 = I₂ • 100
I₂ = (1,6 x 10⁻⁴ • 16 )/100
I₂ = 2,56 x 10⁻⁵ W/m²
Jadi, intensitas bunyi pada jarak 10 m adalah 2,56 x 10⁻⁵ W/m²