Browse
Search
Agenda - 06-27-1983
OrangeCountyNC
>
Board of County Commissioners
>
BOCC Agendas
>
1980's
>
1983
>
Agenda - 06-27-1983
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
4/24/2017 8:06:06 AM
Creation date
4/18/2017 2:53:37 PM
Metadata
Fields
Template:
BOCC
Date
6/27/1983
Meeting Type
Regular Meeting
Document Type
Agenda
Document Relationships
Minutes - 19830627
(Linked From)
Path:
\Board of County Commissioners\Minutes - Approved\1980's\1983
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
97
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Calculate the sound pressure level this way: 410 <br /> 2 <br /> P <br /> SPL = 10 log measured 1 <br /> Preference <br /> TABLE I. SOUND PRESSURES AND ASSOCIATED SOUND PRESSURE LEVELS, <br /> Sound Pressure Sound Pressure <br /> (Microbars) Level (Decibels) <br /> 200 120 <br /> 0.02 40 <br /> 0.0002 0 <br /> 41/ <br /> . <br /> Because decibels are logarithmic quantities , it takes a tenfold <br /> change in the ratio of the square of the sound pressure to the square of <br /> the reference sound pressure to result in a 10-dB change in sound <br /> pressure level. A doubling of the ratio of the squares of the pressures <br /> results in a 3-dB change in sound pressure level . <br /> Sound pressure levels can be easily measured . To do so , <br /> acousticians use a sound level meter , an instrument which , like the <br /> human ear , is sensitive to sound pressure. A sound level melter relates <br /> the sound pressure of a incident sound wave to the standard reference <br /> pressure. A sound pressure level of 0 dB (i .e. , the measured sound <br /> 1 <br /> pressure equals the reference pressure) represents approximately the <br /> weakest sound that can be heard by the average young human ear in the <br /> frequency region of highest sensitivity. At the other end of the <br /> hearing range , humans feel physical pain in their ears when the sound <br /> (10 <br /> 6 <br /> „ <br />
The URL can be used to link to this page
Your browser does not support the video tag.