Tuesday, May 31, 2011
Friday, May 27, 2011
Wednesday, May 18, 2011
dB Scale for Human Hearing
| Decibel Level (dBA) Source | |
| 0 | acute threshold of hearing - weakest sound |
| 15 | threshold of hearing |
| 30 | a whisper |
| 45 | rustling leaves, soft music |
| 60 | normal conversation |
| 75 | average radio or vacuum cleaner |
| *82 | a very noisy restaurant, ACTION LIMIT |
| 90 | lawnmower, Sawzall |
| 100 | tractor, leaf blower, power saw |
| 120 | chain saw, jack hammer, rock concert |
| 135 | jet take-off, amplified music |
| 140 | gunshot, siren at 100 feet; threshold of pain |
| Note: Decibel = measure of loudness, more specifically pressure. | |
Noise-induced
Deafness due to loud noises leads to sensorineural hearing loss, which means areas of the inner ear have been destroyed. With this type of loss, those afflicted can typically only hear very loud sounds or voices. This loss is caused by frequent exposure to sounds greater than 85 decibels (dB), and is different from conductive hearing loss, which results from damage build up of ear wax, ear disorders, or a punctured ear drum. Noise-induced hearing loss can be prevented by using the decibel guide below to regulate exposure to sounds that are too loud.
Safe Sounds:
- Daily conversation: 60 dB
- Daily conversation: 60 dB
- Telephone ring: 65 dB
- Alarm clock/Motor traffic/Vacuum Cleaner: 80 dB
- Lawnmower: 90 dB
- Chainsaw/Drills: 100 dB
- Live rock Music at a concert or club: 100 to 130 dB
- MP3 player ear buds: 100 dB and greater
- Sandblasting: 120 dB
- Gunshots: 150 to 170 dB
Friday, May 13, 2011
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