The intensity of a certain sound wave is 6 ì W.cm2. if its intensity is raised by 20 decibels, the new intensity (in ìW/cm2) is :

Question

a. 60
b. 6.6
c. 6.06
d. 600
E. 12

Answer 1

db = 10*Log I2/I1 = 10*Log I2/6 = 20.
Log I2/6 = 2.
I2/6 = 10^2 = 100.
I2 = 600 W/cm^2.

Answer 2

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