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Sound And Hearing Prezi
Transcript of Sound And Hearing Prezi
By Emma Fadden
What Is Wavelength, Frequency, And Amplitude
How Frequency Relates To Pitch
How Energy Affects Amplitude
The Range Of Human Hearing
Animals That Can Hear Sounds Humans Can't Hear
Speed Of Sound
All About Sound Traveling
The 3 Outcomes Of Sound Striking A Surface
Part 1 Sound
Frequency = the number of times a wave passes by in a period of time
The Outer Ear
The Ear Canal
The Ear Drum
Hammer, Anvil, And Stirrup
Cochlea And Semicircular Canals
The outer ear funnels sound. The outer ear is the part of the ear that you see. The sound waves traveling through the air get funneled into the next part of the ear starting with the outer ear.
Wavelength is the distance from the crest of one wave to the crest of the next. Frequency is is the number of waves that pass by in period of time. Amplitude is the measure of the amount of energy in a sound wave.
If the frequency is high the pitch is high and if the frequency is low than the pitch is low too so the shorter the wavelength the higher the pitch.
The more energy the sound wave has the louder the sound seems. The less energy the sound wave the has the softer the sound seems. When I play my trombone I can add more energy (how much air I blow into my trombone) to make it louder but the pitch does not change.
The range of human hearing is from 20 Hertz (Hz) to 20,000 Hz. That seems like humans can hear very well but there are lots of things that humans can not hear, like a dog whistle, for example. An example of a sound we can hear that is high sounding is a flute and a low sound people can hear is a tuba.
Dogs, mice, and cats can hear higher pitched sounds that humans can not hear called ultrasonic. Dogs cats, and elephants can hear low sounds that humans can not hear called infrasonic.
The closer molecules are to each other the faster sound travels so sound travels the fastest through solids since the molecules are tightly packed together. Sound travels through air the slowest because the molecules are so far apart from each other. Sound travels through liquids the second fastest because the molecules are in between far apart and close together.
Sound travels a lot slower than light. Light travels at around 186,000 miles per second while sound travels at around 1,000 feet per second. Have you ever tried to shout at a building and the sound comes back at you? That is called an echo. An echo happens when you shout, the sound wave hits a surface like building and bounces back. The only way we can make an echo is because sound travels so slowly.
The three out comes of sound striking a surface are reflection, absorption, and diffusion. Most of sound is reflected and is almost as loud as incoming sound. Absorption is when there are different materials that make up the surface some that sound could be absorbed into like a towel. Diffusion scatters sound depending on the desired affect.
The ear canal transmits sound to the eardrum so it is a passage way. The ear canal protects the ear from getting infected.
The eardrum vibrates from the sound waves hitting it as it passes the vibrations to the middle ear. The eardrum also produces mucus which makes this transport possible.
The hammer, anvil, and stirrup amplify sound waves from the ear drum. These three bones transfer vibrations from the eardrum to the inner ear. The hammer comes first, then the anvil, and finally the stirrup.
Fluids in the cochlea and semicircular canals vibrate and stimulate tiny hairs inside the organ. The cochlea converts physical vibrations into electrical impulses. The semicircular canals help to maintain balance by sending messages to the brain saying the head changed position.
The auditory nerve is the path way that allows neural signals to travel from the cochlea to the brain.