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T5B11
Which decibel value represents a power increase from 20 watts to 200 watts?
Pick an answer to check it.
Answer: A. 10 dB
dB = 10 x log(P2 / P1). Step: 200 W / 20 W = 10, and 10 x log(10) = 10 x 1 = 10 dB. Ten times the power is a 10 dB increase.
Tip: 10 times the power = +10 dB.