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Rifles, Reloading, Optics, Equipment
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What is a DB?
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<blockquote data-quote="RangerWalker71" data-source="post: 1187949" data-attributes="member: 91759"><p>Here is a good article on DB's. How they work and are measured. Hope this helps with DB. </p><p></p><p>The <strong>decibel</strong> (abbreviated <strong>dB</strong>) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the <u><a href="http://health.howstuffworks.com/mental-health/human-nature/perception/hearing.htm" target="_blank">human ear</a></u> is incredibly sensitive. Your ears can hear everything from your fingertip brushing lightly over your skin to a loud <u><a href="http://science.howstuffworks.com/transport/flight/modern/turbine.htm" target="_blank">jet engine</a></u>. In terms of power, the sound of the jet engine is about 1,000,000,000,000 times more powerful than the smallest audible sound. That's a big difference!</p><p> On the <strong>decibel scale</strong>, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB. Here are some common sounds and their decibel ratings:</p><p></p><p></p><p> </p><ul> <li data-xf-list-type="ul">Near total silence - 0 dB</li> <li data-xf-list-type="ul">A whisper - 15 dB</li> <li data-xf-list-type="ul">Normal conversation - 60 dB</li> <li data-xf-list-type="ul">A lawnmower - 90 dB</li> <li data-xf-list-type="ul">A car horn - 110 dB</li> <li data-xf-list-type="ul">A rock concert or a jet engine - 120 dB</li> <li data-xf-list-type="ul">A gunshot unsuppressed 140-170dB</li> <li data-xf-list-type="ul">Suppressed 308 22" 128-135 db</li> </ul><p></p><p> You know from your own experience that distance affects the intensity of sound -- if you are far away, the power is greatly diminished. All of the ratings above are taken while standing near the sound.</p><p> Any sound above 85 dB can cause <strong>hearing loss</strong>, and the loss is related both to the power of the sound as well as the length of exposure. You know that you are listening to an 85-dB sound if you have to raise your voice to be heard by somebody else. Eight hours of 90-dB sound can cause damage to your ears; any exposure to 140-dB sound causes immediate damage (and causes actual pain). </p><p></p><p></p><p></p><p><u><a href="http://science.howstuffworks.com/question124.htm" target="_blank">What is a decibel, and how is it measured? | HowStuffWorks</a></u> link article.</p></blockquote><p></p>
[QUOTE="RangerWalker71, post: 1187949, member: 91759"] Here is a good article on DB's. How they work and are measured. Hope this helps with DB. The [B]decibel[/B] (abbreviated [B]dB[/B]) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the [U][URL="http://health.howstuffworks.com/mental-health/human-nature/perception/hearing.htm"]human ear[/URL][/U] is incredibly sensitive. Your ears can hear everything from your fingertip brushing lightly over your skin to a loud [U][URL="http://science.howstuffworks.com/transport/flight/modern/turbine.htm"]jet engine[/URL][/U]. In terms of power, the sound of the jet engine is about 1,000,000,000,000 times more powerful than the smallest audible sound. That's a big difference! On the [B]decibel scale[/B], the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB. Here are some common sounds and their decibel ratings: [LIST] [*]Near total silence - 0 dB [*]A whisper - 15 dB [*]Normal conversation - 60 dB [*]A lawnmower - 90 dB [*]A car horn - 110 dB [*]A rock concert or a jet engine - 120 dB [*]A gunshot unsuppressed 140-170dB [*]Suppressed 308 22" 128-135 db [/LIST] You know from your own experience that distance affects the intensity of sound -- if you are far away, the power is greatly diminished. All of the ratings above are taken while standing near the sound. Any sound above 85 dB can cause [B]hearing loss[/B], and the loss is related both to the power of the sound as well as the length of exposure. You know that you are listening to an 85-dB sound if you have to raise your voice to be heard by somebody else. Eight hours of 90-dB sound can cause damage to your ears; any exposure to 140-dB sound causes immediate damage (and causes actual pain). [U][URL="http://science.howstuffworks.com/question124.htm"]What is a decibel, and how is it measured? | HowStuffWorks[/URL][/U] link article. [/QUOTE]
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