When sound waves reach the eardrum what happens?
The eardrum vibrates
What 3 bones is the ossicle made up of?
Hammer, anvil and stirrup
Where does the oval window pass the enlarged vibrations to?
The cochlea
What is the cochlea shaped like?
A snail’s shell
What causes wax in the ear and what is the cure?
- Overactive gland
2. Syringe the ear
What causes a perforated ear drum and what is the cure?
- Very loud explosion
2. Small holes cure themselves
What causes earache and what is the cure?
- Infection
2. Antibiotics
What causes tinnitus and what is the cure?
- Regular loud noise
2. Avoid loud noises
What is a noise?
An unwanted sound
Name 5 things that noises can do to you?
Make you feel ill Make you tired and short-tempered Damage your hearing Cause tinnitus Make you blind for a while
How can noise be reduced?
Wearing ear protectors.
Using sound absorbing materials to protect rooms and buildings from noise.
Reducing the vibrations at the source of the noise- for example by oiling a machine or tightening screws holding it together.
How do we measure noise?
Using a sound-level meter
What is the loudness of sound measured in?
Decibels
What is the smallest sound that we can hear called?
The threshold of hearing
