Discussion
A signal-to-noise ratio of 20 dB corresponds to a power ratio of
Answer: D
Inverting the power decibel relation:
\[ \mathrm{SNR} = 10^{20/10} = 100 \]
so the signal power is one hundred times the noise power. 20 is the decibel figure repeated as a ratio. 10 would correspond to 10 dB. 400 would follow from treating the 20 dB as a voltage ratio and then squaring, which double-counts the conversion. The 10 dB per decade of power is worth memorising in both directions, since link budgets are worked in decibels and thresholds are quoted as ratios.
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