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[DOC File]SECTION 092900 - GYPSUM BOARD
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30 dB at 20 to 200 MHz. 40 dB at 200 MHz to 1 GHz. 40 dB at 2 to 10 GHz. Skim-Coated Gypsum Board: ASTM C1396/C1396M. Manufactured with a factory-applied skim coat. Retain "Manufacturers" Subparagraph below and list of manufacturers to require products from manufacturers listed or a comparable product from other manufacturers.
200 decibels examples

[DOC File]SPeech Recognition In Noise Test (SPRINT) for H-3 Profile
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The SPeech Recognition in Noise Test (SPRINT) consists of 200 monosyllabic words (Form C of the NU-6 lists) pre-recorded in a background of multi-talker babble noise. The speech-to-babble ratio (+9 dB) is such that normal-hearing soldiers are little affected by the background noise; that is, they can identify 95-100% of the monosyllabic words ...
100db vs 95db

[DOC File]Practice Problems for Test III - Department of Physics
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How much louder (i. e. by what factor is the sound intensity larger) is 120 dB sound than a 60 dB sound? Loudness (sound intensity) is described by the decibel scale, β (in dB) = 10 log(I/I0), where I0 is the reference sound intensity 10-12 W/m2. Therefore, 120 dB has an I given by 120 = 10 log(I/I0)
61db sound

[DOCX File]Sound Intensity .gov
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Sound levels are measured in units of decibels (dB) which like the magnitude units used by astronomers to describe star brightness, is a logarithmic unit of sound power through a surface. dB = 10Log 10 (P1/P0) where P0 is a reference power level of 1 picoWatt (10-12 watts).
100db

[DOC File]CP7e: Ch. 14 Problems
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Two sounds have measured intensities of I1 = 100 W/m2 and I2 = 200 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2? 13. A noisy machine in a factory produces sound with a level of 80 dB. How many identical machines could you add to the factory without exceeding the 90-dB …
loudest man made sound

[DOC File]ENVIRONMENTAL QUALITY (MOTOR VEHICLE NOISE) …
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MAXIMUM SOUND LEVEL PERMITTED FOR MOTOR VEHICLES HAVING TWO WHEELS OR THREE WHEELS (Regulation 4) STANDARD A. Category of Vehicle Maximum Sound Level Permitted (dB (A)) 1. 125 cc. and below 95 2. Above 125 c.c. 99 STANDARD B. Category of Vehicle Maximum Sound Level Permitted (dB (A)) 1. Below 90 cc. 92 2. 90 c.c. and above 95 SECOND SCHEDULE
40 db sound

[DOC File]Module 5 - Iowa State University
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60 dB + 60 dB = 10 log (10 60/10 + 10 60/10) = 63 dB. The sound pressure level is reported as 63 dB re: 20 (Pa. Note that the doubling of sound level causes a 3dB gain. This is often the limit of what is admissible for new activities. Adding more sound sources, e.g. 68, 75 and 79 dB, would just be 10 log (1068/10 + 1075/10 + 10 79/10) = 80.7dB
101 db sound

[DOC File]General Physics – ph 211 - Linn–Benton Community College
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A) 50 Hz B) 200 Hz C) 100 Hz D) 25 Hz . Use: Which of the following is a false statement? A) Sound can travel through a vacuum. B) Light travels very much faster than sound. C) Sound waves are longitudinal pressure waves. D) The transverse waves on a vibrating string are different from sound waves.
200 decibels

[DOC File]STC, MTC, OITC and Rw Explanation
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The RW however is still used as a standard single number rating, without inclusion this 8 dB rule (meaning old pré-1996 and new RW's calculated on the same TL values can differ from one another). ISO 717-1 RW Reference Contour 1/3-Octave Band [Hz] 100 125 160 200 250 315 400 500 Reference Contour [dB] 33 36 39 42 45 48 51 52
200 decibels examples

[DOC File]Chapter 11
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See 24 CFR 200.926d(c)(4), or. ... DNL (Day/Night Average Sound Level) 1 Under 100 db Under 30 db Under 65 db 2 100-115 db 30-40 db 65-75 db 3 Over 115 db Over 40 db Over 75 db Clear zones are areas of highest accident risk located immediately beyond the ends of a runway.
100db vs 95db

200 db sound