A decibel scale is _______.

A decibel scale is _______.

• A. Linear
• B. Logarithmic
• C. Exponential
• D. Geometric

Answer: (B)

The decibel scale is a logarithmic scale for expressing ratios of sound quantities relative to a reference level. This fits why we use it: human hearing spans a huge range of intensities, and a log scale compresses that range into manageable numbers while matching how we perceive loudness, which grows more slowly than actual intensity. The decibel value is defined as 10 times the log base 10 of the intensity ratio (or 20 times the log base 10 of the pressure ratio for sound pressure). Because it’s based on a log relationship, each 10 dB step represents a tenfold change in intensity (or a tenfold change in pressure amplitude, for the amplitude form). So the scale is not linear, and it reflects ratios rather than simple equal-increment values.

The decibel scale is a logarithmic scale for expressing ratios of sound quantities relative to a reference level. This fits why we use it: human hearing spans a huge range of intensities, and a log scale compresses that range into manageable numbers while matching how we perceive loudness, which grows more slowly than actual intensity. The decibel value is defined as 10 times the log base 10 of the intensity ratio (or 20 times the log base 10 of the pressure ratio for sound pressure). Because it’s based on a log relationship, each 10 dB step represents a tenfold change in intensity (or a tenfold change in pressure amplitude, for the amplitude form). So the scale is not linear, and it reflects ratios rather than simple equal-increment values.