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Loudness and Decibels. 
The louder a sound is the greater the distance between the peak and trough when shown on an oscilloscope.
Loudness is measured in Decibels (dB). The information below shows the loudness and decibel value of some common sounds and noises.
Loudness    -   Decibels   -   Example 
Very Loud!  -   150dB      -   Jet Engine
            -   140dB      -   Damage to Hearing
            -   110dB      -   Rock Concert
Medium      -   90dB       -   Pneumatic Drill
            -   70dB       -   Busy Street
            -   60dB       -   Normal Conversation
            -   30dB       -   Whispering
Very Quiet  -   0dB        -   Threshold of Hearing

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If you have a microphone attached to this computer Click Here for a Sound Level Meter.
Try making different noises and notice the dB level produced. Use the test tone to play a 1kHz sound.

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