Sound consists of sound waves. Sound waves generated by vibrations, for example. air or water. These vibrations are transferred into your ear to ear drum, which is boosting the ranks of øreknogler, which in turn sends a wave through the fluid in the inner ear. This wave buoys some small hårceller, which then sends a nerve signal to the brain. The brain perceives and interprets this nerve signal as a sound (see also the ears structure and function).
A lyds strength is measured in decibels (dB). The lowest sound, a human can hear, is about 1 dB and the highest about 140 dB. Normal speech has a strength of around 50-60 dB. There is also talk of a sound wave frequency, which is to say, how many swings are at lydbølgen. seconds. A high frequency means that there are many variations, whereas the low-frequency sounds have few swings. Humans can hear sounds with frequencies between 20 and 20,000 hertz. A sound with the same strength can be perceived differently, h
In everyday language is a very high noise sound level to feel uncomfortable or consists of unpleasant sounds. It is, however, to a certain extent, individually, what is perceived as noise, for example. is people's music tastes are very different. In all the noise, it is that it can affect a person negatively. It may, for example. be stressful to work in an environment with excessive noise, you can get headaches and feel more tired. Very high or prolonged noise can at worst lead to noise damage, which can affect hearing p
A loud sound or noise can cause pain in the ear. It is said that there is a pain threshold for sound. Usually, by this sound over 85 dB, and particularly if it is a high frequency sound. If you work in noisy environments with volumes exceeding 85 dB, the law prescribes the use of hearing protection.
This article is formed on the Health Guide on 07.11.07