Rate of sound pressure level drop

Q.  When a person enters a far field from a near field, the sound pressure level drops off at the rate of _______
- Published on 11 Sep 15

a. 2 dB per 1/4th distance from point source
b. 2 dB per doubling the distance from point source
c. 4 dB per half distance from point source
d. 6 dB per doubling the distance from point source

ANSWER: 6 dB per doubling the distance from point source

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