Daily Question 2015.8.4 (EIA Discussion): 3 Wealth points for replies, plus 5 Wealth points for correct answers (single-choice question)
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There is a 500m train in operation. If the sound pressure level is 70 dB at a distance of 600 m from the railway’s center line, and there is a sanatorium at a distance of 1200 m from the same center line, then the sound pressure level at that sanatorium is ( ) dB. A.67 B.70 C.64 D.60 Correct answer: C. When r > l0 and r0 > l0, LP(r) = LP(r0) – 20lg(r/r0). When r = l0/3, LP(r) = LP(r0) – 10lg(r/r0); this can be approximated as the case of an infinitely long linear sound source. When r = l0/3
D, 60 decibels. --------------
D.60. . . . . . . . . . . . . .
Then the sound pressure level of that sanatorium is (C) dB
There is a 500m train in operation. If the sound pressure level is 70 dB at a distance of 600 m from the railway’s center line, and there is a sanatorium at a distance of 1200 m from the same center line, then the sound pressure level at that sanatorium is (D) dB. A.67 B.70 C.64 D.60
There is a 500m train in operation. If the sound pressure level is 70 dB at a distance of 600 m from the railway’s center line, and there is a sanatorium at a distance of 1200 m from the same center line, then the sound pressure level at that sanatorium is (D) dB.
C.64 !!!!!!!!!!!!!!!!!!!!!!!!!!!!
The sound pressure level of that sanatorium is (C.64) dB.
There is a 500m train in operation. If the sound pressure level is 70 dB at a distance of 600 m from the railway’s center line, and there is a sanatorium at a distance of 1200 m from the same center line, then the sound pressure level at that sanatorium is (d) dB. A.67 B.70 C.64 D.60d
There is a 500m train in operation. If the sound pressure level is 70 dB at a distance of 600 m from the railway’s center line, and there is a sanatorium at a distance of 1200 m from the same center line, then the sound pressure level at that sanatorium is (C) dB. A.67 B.70 C.64 D.60