(2) 20log(10/(2×10-3))=74 [dB]
(3) 10log(3/(1×10-3))=34.8 [dB]
(4) 20log(1500)=63.5 [dB]
(5) 20log(1/5)=−14 [dB]
(6) 10log((5×10-6)/2)=−56 [dB]
(7) 20log((1×10-6)/10)=−140 [dB]
...電気単位・デシベル表現