A National Health Interview survey shows that between 1971 and 1990, the number of people under 65 with signs of hearing loss was increasing. Exposure to loud sounds can cause damage to the ear's hair cells. The movement of these sensitive cells is converted to nerve impulses that the brain interprets as sound. Baby boomers bam themselves into hearing loss. The intensity of the sound wave is the amount of energy transported by the wave per unit time across a unit area.
Sound intensity is proportional to the square of both the amplitude and the frequency of the wave.
Normally, the intensity of sound decreases the farther you move away from the source of the sound. The relationship of distance from the source and intensity of the sound is reduced in a closed space. The subject matter is often sophisticated, but it is presented in a lively manner. Students may be interested in exploring the world of sign language. This multimedia dictionary is a good place to start.