18. Sound travels faster in higher temperatures
In a vacuum sound waves cannot travel
because there are no particles to carry them
Sound waves are produced in musical
instruments and voices by objects and air
vibrations
Things that vibrate make sounds
19. The pinna (the large flap of ear we can see)
collects the sound waves and then these pass
through the ear canal until they reach the ear
drum. The ear drum vibrates and pass the sound
waves into the middle ear. This meets three
small bones called the ossicles that transmit
sound very efficiently. The vibrations from these
bones are passed through the fluid in the
cochlea and make tiny hairs move. When the
hairs move they cause an electrical signal to
travel through the auditory nerve and send a
message to the brain. Your brain makes sense of
the signal and you can hear the sound.