Sound Flashcards
Sound travels through air as a series of what..
Compressions and rarefactions
When do compressions occur
When particles are closest together
Rarefactions occur when..
Particles are furthest apart
Sound travels fastest in..
Solids
Sound travels slowest in….
Gases
What does sound not at all travel in…
A vacuum
What 3 parts make up the outer ear
Pinna
Ear canal
Eardrum
What is the function of the pinna
Collects sound waves and channels them into the ear canal
What is the function of the ear canal
Transports sound from outer ear to eardrum
What is the function of the eardrum
Send vibrations to the inner ear
What is the name of the 3 small bones in the middle ear?
Stapes
Incus
Malleus
What is the purpose of the middle ear?
It transmits sound for outer ear into inner ear
What is the Eustachian tube for
Equalises pressure on the ear drum
Where do the vibrations go beyond the oval window
The cochlea
What is found in the cochlea
Fluid and hairs (fibres)
What do the fibres in the cochlea do?
Convert sound information from the hair cells to the brain
Why does sound travel fastest in solids?
Because the sound vibrations are passed quickly when the particles are close together and bonded to one another
Speed =
Distance divided by time
Does sound travel faster In liquids or gases
Liquids
Why does sound travel quicker in liquids than gases
Because the molecules are closer together in liquids
What is the average hearing range for a healthy young person
20Hz - 20,000 Hz
What are sounds with a frequency below 20Hz called
Infrasound
What are sounds above 20,000Hz called
Ultrasound
