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Intensitas 2 mesin =?
T1 = 10 log (I/Io)
30 = 10 log (I/10⁻¹²)
3 = log I/10⁻¹²
log 10³ = log I/10⁻¹²
1000 = I/10⁻¹²
I = 10⁻⁹ W/m²
intensitas n mesin = n x I
intensitas 2 mesin = 2 x 10⁻⁹ = 2x10⁻⁹ W/m²