Sound Flashcards
How are sounds made
They’re made when a object vibrates
How does sound travel
Sound travels through the air as a series of rarefactions and compressions
How does compressions occur
Compressions occur when particles are closest together
When do rarefactions occur
Rarefactions occur when particles are furthest apart
What do all sound waves need
All sound need particles to be transmitted
What does sound travel faster in
Solids
What does it travel in slowest
Liquids
What does sound not travel in
Vacuum
What parts make up the outer ear
Pinna
Ear canal
Ear drum
What is their function
Their function is to collect and funnel sound waves into the drum
What is made by the body to keep the ear canal clean
Ear wax
What are the names of 3 small bones in the ear
Hammer, anvil and the stirrup
What is the purpose of the middle ear
The middle ear converts and amplifies the sound vibrations
What is the Eustachian tube for
It connects the throat and equalises the pressure
Where do the vibrations go beyond the oval window
The go into the cochlea
What is found in the cochlea
Fluid and hairs
What do the fibres do
They sway in the fluid and trigger electrical pulses
What 3 jobs use echo location
Sonar
Fishing vessels
Navy
How do you calculate the speed of sound
Speed=distance divided by time
Why does sound travel faster in air than gases
Because the molecules are more closer together in liquids than in gases
What is the peak
The tip of the wave
What is the trough
The bottom of the wave
What is the wavelength
The distance from a peak to peak or trough to trough
What is the amplitude
The height of a peak in a wave
Sounds below 20hz are called
Infrasound
Sounds above 20,000hz are called
Ultrasound
What is the effect of length
It makes the pitch of a sound higher
What is the effect of width
It doesn’t do any thing
What is the effect of material
Nothing
