Question

Spherical sound waves are emitted uniformly in all direction from a point source. The variation in sound level SL. As a function of distance r from the source can be written as where a and b are positive constants.
A. `SL=-blogr^a`
B. `SL=a-b(logr)^2`
C. `SL=a-blogr`
D. `SL=(a-b)/(r^2)`

Answer 1

Correct Answer - C
`SL=10log((k)/(I_0))`
`=10log((k)/(I_0r^2))`
`=10logK-10log(I_0r^2)`
`=10logk-10logI_0-20logr`
`=a-blogr`