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Sound waves are emitted uniformly in all...

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

A

A. `beta= a-b log r`

B

B. `beta= a-b/r^2`

C

C. `beta= -b log r^2`

D

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

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