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TI2 = 90 + 10.log( n2/n1 )
TI2 = 90 + 10.log( 20/1)
TI2 = 90 + 10.log20
TI2 = 90 + 10.( log2 + log10)
TI2 = 90 + 10.( 1,3 + 1 )
TI2 = 90 + 23
TI2 = 113 dB