Question

The intensity of a certain sound wave is 6 ì W.cm2. if its intensity is raised by 10 decibels, the new intensity (in ìW/cm2) is :
a. 60
b. 6.6
c. 6.06
d. 600
E. 12


You can calculate this if you wish using logs, but you can do it in your head: 3 db means double power, 6 db means 4x power, 9 db means 8x power, and ...10db means a power of 10x.


10db=10 log (P/6)
1= log (p/6)
10^1=P/6
p=60W/cm^2




You can calculate this if you wish using logs, but you can do it in your head: 3 db means double power, 6 db means 4x power, 9 db means 8x power, and ...10db means a power of 10x.


10db=10 log (P/6)
1= log (p/6)
10^1=P/6
p=60W/cm^2