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TI₁ - TI₂ = 20 log (r₂/r₁)
TI₁ - TI₂ = 20 log (20/2)
TI₁ - TI₂ = 20 log 10
TI₁ - TI₂ = 20 dB ← jwb
catatan
setiap jarak berlipat 10 kali, taraf intensitas berkurang 20 dB