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n₂ = 1
TI₁ = 90 dB
TI₂ = TI₁ + 10 * Log (n₂/n₁)
TI₂ = 90 + 10 * Log (1/100)
TI₂ = 90 + 10*(-2)
TI₂ = 90 - 20 = 70 dB
Jawaban D