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TI₁ = 140 dB
R₂ = 300 m
ditanya : TI₂ = ... ?
dijawab :
TI₂ = TI₁ - 20 log (R₂/R₁)
= 140 - 20 log (300 / 30)
= 140 - 20 log 10
= 140 - 20
TI₂ = 120 dB