5Conversion of Sound Energy Sound causes our eardrums to vibrate.This is an example of sound energy being converted from one form of energy to another, mechanical energy. Both forms are kinetic energy.
6Conversion of Sound Energy Click on each box below to see how- sound energy is converted to kinetic energy- and to electrical energy
7Conversion of Sound Energy Sound energy is converted into electrical energy in a telephone.How?The sound energy is converted to electrical energy by a microphone. Then into radiant energy when it is sent to the other phone.
8Conversion of Sound Energy At the other end of the phone lineThe radiant energy is converted back to electrical energy which is converted back into sound energy.
9Sound TransmissionTransmission means sending from one place to another.Sound waves are transmitted by particles in the air.Animation courtesy of Dr. Dan Russell, Kettering UniversityAir MoleculesEarSpeaker
10Sound Transmission in Air Sound waves in air are passed between moleculeWhat happens when you change frequency above?
11Sound does not Travel in a Vacuum A java applet is embedded in this slide, click to activate it.Click on the graphic above to start the simulation.
12The Speed of Sound The speed of sound in air is about 340 m/s. So every second, a sound wave travels 340 metres.Sound travels at different speeds in different materials.
13The Speed of SoundSound travels at different speeds in different materials.In air m/sIn water m/sIn steel m/s
14The Speed of SoundWhich is faster, the speed of light or the speed of sound?How do you know?
15The Speed of Sound The speed of light is much faster! The speed of light ,000,000 m/s(approximately 186,282 miles per second )The speed of sound in air m/s(0.21 miles per second)
16Light and Sound Fireworks: Waves on a beach: Lighting: - you see the firework explode before you hear the bang.Waves on a beach:- you’ll see the waves break before you hear them breaking.Lighting:- you see the lightningbefore you hear the thunder.