Hearing, The Ear, Sound And Light Flashcards
where do sound waves travel through
the air and into the ear
what do sound waves cause the eardrum to do
vibrate
where are vibrations passed on to
passed on to the cochlea
where is the cochlea
in the inner ear
what happens in the cochlea and what are they called
vibrations are changed to electrical signals called impulses
what takes impulses to the brain
nerves
when do we hear the sound
when the message reaches the brain
what is bad about loud sounds
damage the eardrum or cochlea
what happens to people who are exposed to loud sounds for long periods of time
at risk of damaging their hearing or even suffer permanent deafness
what can prevent hearing damage
people who work in loud environments wear ear protection
what conditions can effect hearing damage
wax, ear infections and getting older
how can we measure how loud a sound is
by using a sound intensity meter
in what unit do we measure the loudness
decibels ( dB )
what is the threshold of hearing and what is it
the quietest sound of hearing we can hear and it is 0dB
what do soft materials do with sound
absorb it
what are soft materials used in
soundproofing and ear protectors
what type of energy can travel through space ( a vacuum )
light energy can but sound energy cant
speed of light against sound
light travels a million times faster than sound
what speed does light travel at
300 million meters per second or 300 000 km/s
what speed does sound travel at
330 million meters per second
what waves can be reflected
light and sound waves
what do we hear a reflected sound as
an echo
