Hearing Conservation

Hearing Conservation $20.00 USD Noise, or unwanted sound, is a pervasive occupational health problem. It is a by-product of many industrial processes. Sound consists of pressure changes in a medium (usually air), caused by vibration or turbulence. These pressure changes produce waves emanating away from the turbulent or vibrating source.  Sound pressure level is a logarithmic measure of the magnitude or intensity of the pressure change; it is perceived as loudness. Sound pressure level is expressed in decibels, abbreviated dB. Because of the logarithmic scale used to measure sound pressure or noise, a small increase in decibels represents a large increase in sound energy. Technically, each increase of 3 dB represents a doubling of sound energy; an increase of 10 dB represents a tenfold increase, and a 20 dB increase represents a 100-fold increase in sound energy. (For purposes of 29 CFR 1910.95, however, a doubling rate of approximately 5 dB is used. That is, a 5 dB increase in level is permitted each time the exposure duration is decreased by half.)  The frequency of a sound is the number of times that a complete cycle of compressions and rarefactions occurs in a second. The descriptor, which used to be "cycles per second," is now hertz (Hz). Frequency is perceived as pitch. Most everyday sounds contain a mixture of frequencies generated by a variety of sources. A sound's frequency composition is referred to as the spectrum.
Array
$20.00

QUANTITY DISCOUNTS

1-10
$20.00
11-25 $18.00
26-50 $17.00
51-75 $16.00
76-100 $15.00
101-UP $10.00

Description

Hearing Conservation

$20.00 USD

Noise, or unwanted sound, is a pervasive occupational health problem. It is a by-product of many industrial processes. Sound consists of pressure changes in a medium (usually air), caused by vibration or turbulence. These pressure changes produce waves emanating away from the turbulent or vibrating source.  Sound pressure level is a logarithmic measure of the magnitude or intensity of the pressure change; it is perceived as loudness. Sound pressure level is expressed in decibels, abbreviated dB. Because of the logarithmic scale used to measure sound pressure or noise, a small increase in decibels represents a large increase in sound energy. Technically, each increase of 3 dB represents a doubling of sound energy; an increase of 10 dB represents a tenfold increase, and a 20 dB increase represents a 100-fold increase in sound energy. (For purposes of 29 CFR 1910.95, however, a doubling rate of approximately 5 dB is used. That is, a 5 dB increase in level is permitted each time the exposure duration is decreased by half.)  The frequency of a sound is the number of times that a complete cycle of compressions and rarefactions occurs in a second. The descriptor, which used to be "cycles per second," is now hertz (Hz). Frequency is perceived as pitch. Most everyday sounds contain a mixture of frequencies generated by a variety of sources. A sound's frequency composition is referred to as the spectrum.

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