1.

The sound power l evel of an out door nondirectional point source is 90 dB. Considering an atmospheric impedance of 400 rayls, the sound pressure level at 10 m distance from the source is _______ dB.

A. 58 to 60
B. 68 to 70
C. 78 to 80
D. 88 to 90
Answer» B. 68 to 70


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