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Decibels

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We know that L=K log10 l, where L is loudness and l is intensity. What is K then?

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Q. Most people interpret a 9.0 dB increase in sound intensity level as a doubling in loudness. By what factor must the sound intensity be increased to double the loudness ?

Q. Assertion :A

80 d B

sound has twice the intensity of a

40 d B

sound. Reason: Loudness of a sound of a certain intensity I is defined as

L_{d B} = 10 {log}_{10} {\frac{I}{I}}_{o}

Q. Mark the incorrect statements.
(a) intensity of sound depends on the response of our ears
(b) loudness can be measured as a physical quantity
(c) loudness is a subjective quantity.

Q. Comment on the statement 'loudness of sound is a subjective quantity, while intensity is an objective quantity.'

Q. When we increase the loudness of sound of a TV, the property of sound that changes is:

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