Parts of the Ear
The COCHLEA
Describe the shape of our outer ear and why it is important.
The outer ear is shaped like a funnel- to funnel sound waves inside!
Sound is measured in ______.
Frequency is measured in ________.
Decibels (db) 0-200db.
Hertz (hz)
Whales.
What is a hypothesis?
An educated prediction based on your prior knowledge.
Earwax is a yellowish, sticky substance. It takes dirt and dust particles (adheres to the ear canal walls) to allow sound waves to travel freely to the eardrum.
Sounds waves travel in the ear canal and then make contact with the _______________.
Eardrum.
Properties of sound:
If sound is not reflected, it is ______________.
Absorbed.
The loudest sound ever recorded was a ______ explosion.
Volcanic
Why would you sound-proof a YouTube studio?
Refer to your sound booklet :)
After the cochlea, what carries sound waves to the brain?
Nerves. (specifically the auditory nerves).
Which materials would produce the best echoes?
Metal, hardwood, concrete.
Draw a low volume, high-pitch sound.
The sound waves would be very close together (high-pitch), but small in height (low volume).
Draw what a high-frequency, high volume sound would look like.
The sound waves would be very close together (high-frequency) and very tall (high volume).
The higher the frequency the closer the waves are together.
The eustachian tubes regulate the amount of pressure in the middle ear. If the middle ear needs more air, the eustachian tube `pushes` air into it. If the air pressure is too high in the middle ear, the eustachian tube takes air out.
Why do some animals use echolocation?
To navigate (find their way), and/or to find food.
When does a sound become a noise?
A noise is a loud, disturbing sound that is unpleasant or disruptive.
Why is it easier to hear someone speaking in class than underwater?
:) Refer to your sound booklet :)
Describe the part of the cochlea that `dies` as we age (or is damaged from extremely loud sounds).
Over time, our cilia can be damaged. The first to `die`is the cilia responsible for high-pitch sounds.
How does sound travel to our brain (explain the order, from part to part).
Outer ear, ear canal, eardrum, hammer, anvil, stirrup, cochlea, nerves, brain.
True or False: Sound travels faster than light.
And,
Sound travels ____x faster in liquid.
Sound travels ____x faster in steel (l`acier).
Light travels faster than sound.
And,
4x
15x
Sound is.....
vibrations that our ears hear!
Describe what you observed during the tuning fork experiment (salt part, not water).
1. one tap no touch.
2. one tap TOUCH
Refer to sound booklet :)