Sound Basics
Sound travels in _____.
Waves
The outer part of the ear.
Pinna
After the eardrum vibrates, what moves next?
The tiny bones.
What is the shortened abbreviation for decibels?
Sound is the result of ___________ colliding due to pressure differences.
Air molecules
Which travels faster: sound in air or water?
Water
What part looks like a snail shell?
Cochlea
Where do the vibrations go after the stirrup?
Into the cochlea.
What range of decibels do we normally have conversations in?
20-60 dB
The high points of a sound wave are called _______.
Compressions
What part of the ear does sound hit first inside the head?
Eardrum.
What vibrates when sound hits it?
Eardrum.
What moves the ear hairs inside the cochlea?
Liquid.
What will happen if you have prolonged exposure to 100+ decibels for hours on end?
Your ear hairs will likely die and you will lose hearing.
The low points of a wave are called ________.
Rarefactions.
What organ helps us understand sound?
The brain.
Name one tiny bone.
Hammer, Anvil, or Stirrup/Stapes.
What moves after the ear hairs and liquid in the cochlea move?
Nerves.
What definition occurs between 120 and 140 decibels?
The Threshold of Pain
Amplitude is _________.
Perceived loudness. Amplitude measures the air pressure (and the amount of energy it carries), so in a wave, it is the distance of the wave from the centerline. A larger amplitude means a louder sound.
Why does sound travel fastest in solids?
Particles are closest together.
What do the three tiny bones do?
What do the nerves send to the brain?
Signals!
Once your hair cells die, they do not ___________.
Regenerate.
Amplitude is measured in _______
decibels (dB)