Daily Question 2015.7.24 (EIA Discussion): 3 Wealth points for replies, plus 5 Wealth points for correct answers (single-choice question)
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This post was last edited by Zhang Xiaopeng on 2015-7-25 at 20:39. A window in a certain workshop has an area of 20 m2. It is known that the sound pressure level inside the room near the window is 90 dB, and the difference in sound pressure levels between the inside of the room and the outside near the window is 15 dB. What should be the sound power level of the equivalent external sound source? A. 28dB B. 75dB C. 88dB D. 103dB Correct answer: C. The outdoor sound pressure level is: L1-L2=TL+6; the sound power level of the equivalent outdoor sound source should be: LW2=L2+10lgS
The area of a window in a certain workshop is 20 m2. It is known that the sound pressure level inside the room near the window is 90 dB, and the difference in sound pressure levels between the interior and exterior near the window is 15 dB. The sound power level of the equivalent external sound source should be (B).
This post was last edited by akroise on 2015-7-24 at 11:21. Is there a mistake in the question? There seems to be no correct answer option. Ugh, once I saw the answer, it became clear – the correct choice is C.
Answer to this question: C, 88dB
In a certain workshop, one window has an area of 20 m2. It is known that the sound pressure level inside the room near the window is 90 dB, and the difference in sound pressure levels between the inside of the room and the outside near the window is 15 dB. The sound power level of the equivalent external sound source should be C
In a certain workshop, there is a window with an area of 20 m2. The sound pressure level inside the room near the window is 90 dB, and the difference in sound pressure level between the inside of the room and the outside near the window is 15 dB. The sound power level of the equivalent external sound source should be (C. 88 dB).
The area of a window in a certain workshop is 20 m2. It is known that the sound pressure level inside the room near the window is 90 dB, and the difference in sound pressure level between the interior and the exterior near the window is 15 dB. The sound power level of the equivalent external sound source should be ( ). C.88dB
Is the answer D? I’m not sure, please give some guidance
Correct answer: B.75dB .....