Answers

2015-02-21T13:36:18+05:30
LOUDNESS:
*The sensation produced in the ears which enables us to distinguish between a faint sound and a loud sound is called loudness.
*Loudness is measured indecibel.Loudness depends on the senstivity of ears. 



INTENSITY:
*The average energy transported by a sound wave per second per unit area is called intensity.
*Intensity is measured in unit of watts per square metre.Intensity does not depends on the senstivity of ears.
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2015-02-21T14:41:54+05:30
Loudness
Loudness is a subjective quantity. It depends upon the sensitivity of the human ear. A sound may be loud for a person but the same sound may be feeble for a person who is hard of hearing. Loudness cannot be measured as a physical quantity because it is just a sensation which can be felt only.
Intensity of sound
Intensity of sound is an objective physical quantity. It does no depend on the sensitivity of the human ear. Intensity of a sound can be measured as a physical quantity.
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