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What is the gain in decibels if the amplifier has an input of 3mV and output of 5V?

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What is the gain in decibels if the amplifier has an input of 3mV and output of 5V?

(a) 54.4

(b) 64

(c) 64.4

(d) 32

I had been asked this question in an online quiz.

This interesting question is from Gain, Attenuation & Decibels topic in portion Fundamentals of Electronics of Avionics

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The correct option is (b) 64

Best explanation: dB = 20 log(5/0.003) = 20 log 1666.67 = 20 x 3.22 =64.4.

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