[Technical Exchange Post] One question per day, June 14, 2015 (EIA discussion); 3 wealth points for replies, plus 5 wealth points for correct answers
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This post was last edited by Zhang Xiaopeng on 2015-6-24 at 12:50. 12. The tablet press in the factory generates noise; the noise level measured 3 meters away from the press is 80 dB. The noise standard required for residential buildings is 50 dB. Therefore, the distance at which residential buildings should be located from the tablet press is ( )m. A.65 B.80 C.95 D.100 Explanation: The basic formula for the geometric decay of a point sound source with no directivity is: LP(r) = LP(r0) – 20lg(r/r0). Substituting the values, we get 50 = 80 – 20lg(x/3); from this, x = 95
The factory’s tablet press generates noise; the noise level measured 3 meters away from the press is 80 dB. The noise standard required in a residential building is 50 dB. Therefore, the distance at which the residential building should be located from the tablet press is ( )m. A.65
C.95 C.95 C.95
The factory’s tablet press generates noise; the noise level measured 3 meters away from the press is 80 dB. The noise standard required in a residential building is 50 dB. Therefore, the distance at which the residential building should be located from the tablet press is ( )m. C.95
The factory’s tablet press generates noise; the noise level measured 3 meters away from the press is 80 dB. The noise standard required in the residential building is 50 dB, so the distance at which the residential building should be located from the press is (C. 95) meters.
The factory’s tablet press generates noise; the noise level measured 3 meters away from the press is 80 dB. The noise standard required in the residential building is 50 dB, so the distance between the residential building and the tablet press should be (C. 95) meters.
The factory’s tablet press generates noise; the noise level measured 3 meters away from the press is 80 dB. The noise standard required in the residential building is 50 dB. Therefore, the distance between the residential building and the tablet press should be (C) meters. A.65 B.80 C.95 D.100