Define work? what is the SI unit of loudness?
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decibels
The loudness of sound is measured in units called decibels (dB). A decibel unit expresses the relative intensity of sounds on a scale from zero for the average least perceptible sound to about 100 dB, which is near the level most people find uncomfortably loud.
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Work is the amount of work done.
SI unit of loudness is Decibel (dB).
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