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9. Intensity level is given by the equation I.L. = 10 lg (1/lo ) where IL is the intensity level of a sound in dB, I is the intensity of that sound in w/m and lo is the intensity at the threshold of hearing ( equal to 1 x 10-12 w/m2). What will be the intensity level in db of the following sounds? a) Rustling leaves, at 1 x 10-11 w/m2 b) People working in the library 1 x 10-9 w/m c) Fire alarm at 1 x 10-2 w/m2 Ascentis Validated from 1st August 2019 to 31st July 2024 V1 Page 9 of 9