Sound is a Wave Sound is a wave that is produced by a vibrating object and travels through matter The disturbance that travels through a sound wave isa vibration. Sound is a type of mechanical Wave
Vibrations are required to start sound waves A vibrating object pushes and pulls on the medium around it and sends out waves in all directions. How sound Waves are Produced
Your sound making instrument in your own body is your vocal cords. How sound Waves are Produced
Your muscles push air up from your lungs and through the narrow opening between the vocal cords. The force of the air causes the vocal cords to vibrate The Vibrating vocal cords produce sound waves Sound waves are detected
The shape of the human ear helps it collect sound waves in the following sequence Your outer ear collects sound waves and reflects them into a tiny tube called the ear canal. They go through the ear drum and sound waves then strike the eardrum and make it vibrate. The middle ear contains three tiny, connected bones called the hammer, anvil, and stirrup. They carry vibrations to the inner ear. Sound waves are detected
3. One of the main parts of the inner ear the cochlea contains about 30,000 hair cells. The hair cells bends from vibration and sends electrical signals to the nerves of your brain. Sound Waves vibrate particles
Sound waves vibrate particles and produce a sound. The vibration sends sound waves throughout the air and transfers kinetic energy from one place to another. Sound Waves vibrate particles
Sound is a mechanical wave and can only move through a medium. Sound waves can travel throughout air, solids, liquids, because all mediums are made up of particles. The Speed of sound depends on its medium
Sound travels more slowly than light and sounds travel at different speeds. Two factors affect the speed of sound : the material that makes up the mediumand the temperature. The Effect of the material
Sound travels faster through liquid than it does through gases, because liquids are denser than gas. The particles are closer together in a liquid so divers underwater would hear a sound sooner than people above ground. The Effect of the material
Sound can also travel though solids. They are elastic and vibrate back and forth. The particles are packed even closer together than they are than in liquids or gases. The Effect of the Material
Materials and Sound Speeds Medium State Speed of Sound Air (20 degrees Celsius) Gas 344 m/s (769 mi/h) Water (20 degrees Celsius) Liquid 1,400 m/s (3,130 mi/h) Steel (20 degrees Celsius) Solid 5,000 m/s (11,200 mi/h) The Effect of the Material
Sound travels faster through a medium at higher temperatures than lower ones. Gas for example are not held tightly together as particles in a solid. The Effect of the Material
The higher the temperature, the more gas particles bounce. It takes less time for particles to move around in hot temperatures, thus particles move faster in hot air than in cold air. The Effect of the Material
Temperature and Sound Speeds Medium Temperature Speed of sound Air 0 degrees Celsius (32 Degrees Fahrenheit) 331 m/s (741 mi/h) 100 degrees Celsius (212 degrees Fahrenheit) 386 m/s (864 mi/h)