Sound

Copyright 2002 David A. Wheeler, Ph.D., PHR, CMT NoStress@mail.com   Last updated 09/19/05 01:54 PM

File: sound.htm


Decibels = 1/10 Bel

Logarithmic Scale
 
0 dB Threshold of human hearing
10 db 10x
20 db 100x
30 dB 1000x whisper
60 dB 1,000,000x Office environment
90 dB 1,000,000,000x OSHA limit for 8 hr work day
120 dB 1,000,000,000,000x Instantaneous Hearing Damage
Next to speakers at a rock concert
150 dB 1,000,000,000,000,000x Jet taking off at 100ft
180 dB 1,000,000,000,000,000,000x space shuttle cockpit at launch

OSHA Limit

90 dB for 8 hrs

95 dB for 4 hrs

100 dB for 2 hrs

105 dB for 1 hr

110 dB for 30 min

115 dB for 15 min

120 dB never

Peak sensitivity

A weighted

Low frequency vs High Frequency

 

 

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Last modified: 10/04/05