Wondering About Sound (2nd Ed, 1986)

[Music] okay ready tapes Rolling this is wondering about sound take [Music] one sound sound sound sound sound [Music] sound sound sound sound everybody gather around let's learn about the world of sound sounds are sof sound are loud like the sound that's made by a cheering crowd almost everywhere hear some sound high or low loud or sof near or far sounds are everywhere you are [Music] how hard sounds made you wonder the rust wind and the Thunder there simple explanation and it has to do with vibration vibration occurs when something is made to move back and forth real quick like the strings on a guitar when a player begins to pick [Music] and when these strings are strung can you see them move around what happens the strings vibrate that's what creates the sound sound sound every sound that you may hear is caused by vibration is that clear now we'll do a review for you so if it isn't have no fear when you hit a drum skin vibrate when symbols crash they both vibrate when you tap the forth like this it vibrates and makes a dull low hum vibration creates sounds the same way with guitars symol and [Music] drums when you hear the lung bell ring vibration cause that too take time out listen to The Sounds vibrations create around [Music] [Music] [Music] you air passes over evoke the cord so they vibrate when you talk it's the same with all the animals as they bark and grow and squat throw a peble into water and see those ripples there just like ripples in the water sound waves move through the air but sound waves travel in all directions and your ears are used for the collection of sounds that occur all around you now listen close you'll hear sounds around you inside your ear is your eardrum a wall of skin that stretches and every sound that enters your ear the eardrum surely catches now there are three small bones inside your ear that you have to have if you want to hear cuz when your eardrum starts to vibrate these bones begin to move so repeat after me repeat after me and we'll name each bone 1 2 3 they called The Hammer Hammer the Anvil Anvil the Stirrup Stirrup one more time the Hammer Hammer the Anvil Anvil the Stirrup Stirrup that's it now some sounds that you hear can be harmful to your ear like when you have the volume turned up real loud on your radio video game sounds too can't hurt your ears you know it's true too long without a break can't cause your head to a but now these are being used so his ears won't get abused by the constant loud engine whine of big airplanes moving down the [Music] line sounds are also helpful just like this smoke the [Music] line sounds wake up and War up and keep us safe from har throw a pezel into water and see those ripples growing if something happens to cross their path the ripples just keep going and it's just the same with sound wave when objects get in their way they go above below around or through and here's something else that sound waves can do besides just moving through the air they can travel underwater too [Music] [Music] sound waves can also travel through metal wood and brick sound waves move well through solid objects it's not a magic trick metal r [Music] sounds are high sounds are low there are many things about sound to know like when we hear a sound that time we say it has a high pitch and when we hear a sound that's low say it has a low pitch now what is the pitch of this sound now what is the pitch of this sound now what is the pitch of this [Music] sound now what is the pitch of this [Music] sound almost everywhere you go you'll hear some sound high or low loud or soft near or far sounds are everywhere you are all the sounds that you may hear are called byby vibration is that clear vibrations create sound waves that move like ripples on a lake once flat sound waves are collected by your ear and basically that is how you hear sound is it loud sound is it soft sound is it low sound is it high sound [Music] sound sound sound [Music] sound 2 3 4 [Music] round