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Source waves are emitted uniformly in al...

Source waves are emitted uniformly in all directions from a point source. The dependence of sound level `beta` in decibels on the distance `r` can be expressed as (a and b are positive constants)

A

`beta= a-b log r`

B

`beta= a-b/r^2`

C

`beta= -b log r^2`

D

`beta= a-b(log r)^2`

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