An amplifier has a power gain of 100. Its db gain is ________________?
Correct answer: B. 20 db
- A. 10 db
- B. 20 db
- C. 40 db
- D. None of the above
Explanation
Power gain in decibels is 10 log₁₀(Pout/Pin), so 10 log₁₀(100) = 20 dB. Using 20 log for a power ratio would incorrectly give 40 dB.
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