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Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 log10 (AR)
Decibel = 20 loge (AR)
Decibel = 20 log10 (AR)0.5
Decibel = 20 loge (AR)0.5

Correct Answer: Decibel = 20 log10 (AR)

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