Unit+5+Sound

Unit 5-Sound

**======The difference between mechanical and electromagnetic ======** Mechanical waves need a medium to go through, they need matter, substance. For example sound is a mechanical wave, it needs to travel through air and vibrate to make sound, that’s why we can’t hear anything in space because there is nothing for sound to travel through. Sound can travel through air, liquid or solid molecules. Electromagnetic waves don’t need a medium or substances to go through. For example light, light doesn’t need air or anything for us to see it. That's why we are able to see the light from sun in space. The three sources of sound wave can be anything, instruments like guitar or drum, our voice and noises. http://www.youtube.com/watch?v=_ovMh2A3P5k

Surfer's Ear: Surfer's ear is irritation from cold wind and water causes. It causes the bone surrounding the ear canal to develop lumps of new bony growth which constrict the ear canal. As the condition progresses, the diameter of the ear canal decreases, causing hearing impairment.

How a hearing aid works: A hearing aid amplifies the wave that reaches your ear so that you can hear better than you normally would be able to. It's a device to help deaf or close to deaf people hear. There are many different types of hearing aid you can wear, there are some that's behind the ear, in the outer ear, frames of eyeglasses or against the body or in the clothing. It's made up of a microphone, an electronic amplifier and an earphone/speaker, batter and volume control. Here is an example of how a hearing aid works: Basically the sound waves passes throught the microphone and then the microphone convert the wave into electrical energy, then it goes to the amplifier boosts the energy. Finally the energy goes to the loudspeaker(earphone) and convert from electrical energy back to sound waves so we can hear. Here is a list of recommended hearing aid services: -Hearwell -Help in Hearing -David Mason R.H.A.D. -Regional Hearing services

The hearing aid brand recommended by all of these services is Samsung. Samsung has the highest amplitude, and highest battery power