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Home > A2C > Chapter 11 > Lesson 11.3.2 > Problem 11-150


Logarithms are used to measure the “loudness” of sound. Decibels (dB) are logarithmic units used to descrbe a ratio of two levels of intensity or pressure. The difference between two levels of sound pressure (P1 and P2) is defined as dB. Usually, when decibels are used to describe just one sound, it is assumed that that sound is being compared to a reference level of 20 micropascals.

  1. How many decibels correspond to doubling the pressure of a sound?

  2. What is the sound pressure of a sound described as 60 dB?

  3. What does 0 decibels mean?

    The sound ratio is .

  4. How many times more pressure is in a sound of than of ?

    times more pressure.