An amplitude ratio of 0.1 corresponds to _____________ decibels?
Correct answer: B. -20
- A. 20
- B. -20
- C. 10
- D. -10
Explanation
For an amplitude ratio, decibels are calculated as 20 log₁₀(ratio). Thus 20 log₁₀(0.1) = 20(-1) = −20 dB, with the negative sign indicating attenuation.
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