Question

standard unit of loudness, amplitude?

Answer 1

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. Normal speech is around 50 to 60 dB.
Amplitude is measured in metres (m). The greater the amplitude of a wave then the more energy it is carrying.
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Answer 2

hyy.... unit of loudness is 'decibel' ....and unit of amplitude is 'metres '.....

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