Decibels are a _____; The actual level is divided by the _______.

Decibels are a _____; The actual level is divided by the _______.

• A. Ratio; Starting level
• B. Difference; Reference level
• C. Sum; Baseline
• D. Product; Starting level

Answer: (A)

Decibels express a ratio on a logarithmic scale, not a simple difference or an absolute amount. The measurement is always framed as the actual level relative to a reference level, which is why the calculation involves dividing the actual value by that reference and then taking a logarithm. For power, dB = 10 log10(P/P0); for amplitude, dB = 20 log10(V/V0) or I/I0, depending on the quantity. This shows that the key idea is comparing the actual level to a standard reference, forming a ratio that the log function converts into the decibel value. That’s why the correct pairing is ratio for the first blank and reference level for the second.

Decibels express a ratio on a logarithmic scale, not a simple difference or an absolute amount. The measurement is always framed as the actual level relative to a reference level, which is why the calculation involves dividing the actual value by that reference and then taking a logarithm. For power, dB = 10 log10(P/P0); for amplitude, dB = 20 log10(V/V0) or I/I0, depending on the quantity. This shows that the key idea is comparing the actual level to a standard reference, forming a ratio that the log function converts into the decibel value. That’s why the correct pairing is ratio for the first blank and reference level for the second.