Sound Waves : Sound Waves By: Elizabeth Reyers and Liz Bykerk What is a Sound Wave? : What is a Sound Wave? A sound wave is a pattern of disturbance caused by the movement of energy traveling through a medium as it moves away from the source of sound.
The source is some object that creates a vibration, such as a ringing phone or someone’s voice.
The wave makes an outward pattern. Vibrations : Vibrations Happens when something moves back and forth
Longitudinal- squeezing together at some points and spreading out at others (Back and Forth)
Transversal- The way that some waves travel, moving up and down as they move forward (Up and Down) Frequency : Frequency How many times each second something moves or vibrates
High Frequency Frequency : Frequency Amplitude : Amplitude How far something vibrates or moves. How big it is.
High Amplitude Pitch : Pitch There is two types of pitch:
Low Pitch High Pitch Waves : High Pitch Waves The more energy a sound wave has, the higher the sound seems to be.
The intensity of the sound is the amount of energy that there is. Which means that there is also a higher amplitude.
For example: A bird or a flute would make a high pitch noise. Low Pitch Waves : Low Pitch Waves Just the opposite of high pitch waves. The lower the energy of the wave, the lower pitch it will seem.
This also means that the amplitude will also be lower.
For example: A lion or a tuba would give over low pitch sound waves. Seeing a Sound Wave! : Seeing a Sound Wave! http://www.youtube.com/watch?v=s9GBf8y0lY0 Quality : Quality Pitch and loudness are two ways that sounds are different. But another way is quality:
Noise Pleasant Quality : Pleasant Quality A pleasant sound has:
The regular waves repeat over and over Noise : Noise However, the waves of “noise:”
Do not repeat over time Demonstration Of How Waves Work : Demonstration Of How Waves Work http://illuminations.nctm.org/ActivityDetail.aspx?ID=37 Your Turn! : Your Turn! The following slides are questions to test what you have learned! Question One: : Question One: Does sound travel faster under water or in the air? Answer One: : Answer One: The sound will travel faster under water than in the air Question Two: : Question Two: Can sound travel through a vacuum? Answer Two: : Answer Two: No sound cannot travel through a vacuum Question Three: : Question Three: How can an object produce sound waves? Answer Three: : Answer Three: When an object vibrates, moves backwards and forwards, in the air Sources: : Sources: http://www.gcsescience.com/pwav8.htm