Decibel (dB)
Unit that measures the intensity or loudness of sound.
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About Decibel (dB)
The volume or loudness of a sound is determined by the sound pressure level. The higher this is, the louder the sound is. Sound pressure level is measured in decibels (dB). The word “decibel” comes from “deci” (meaning “one tenth”) and the name of the man who invented the decibel unit, Alexander Graham Bell.
The frequency describes how high the pitch of a sound is. It is measured in (Hz), named after the German physicist Heinrich Rudolf Hertz. The frequency is how many vibrations there are per second. For instance, 20 hertz means 20 vibrations per second. This very slow vibration can barely be heard as a very low tone. The higher the frequency, the higher the pitch.