5.1.4 - Sound in Solids and The Ear Flashcards
What happens to sound once it has been reflected many times?
Absorbed.
What happens to the particles of a surface when a sound is absorbed?
So what happens to the surface?
They vibrate.
Gets a little hot.
What part of a microphone can move?
Diaphragm.
What does the diaphragm do when it absorbs the sound wave?
Creates a changing electrical current.
What is a natural frequency example?
Ruler ping. Frequency depends on the length of the ruler over the side.
What is an example of resonance?
Hairs in your cochlea.
What do hairs in your cochlea have?
A natural frequency.
What will happen to the hairs in your cochlea if you apply a vibration at their natural vibration?
They will vibrate with a very big amplitude.
What do different length hairs in your cochlea have?
Different natural frequencies.
Are shorter hairs higher sounds or lower sounds?
Higher.
What happens to the hairs in your cochlea when you age?
You lose the shorter hairs.
Why can’t humans hear every frequency?
Because their cochlea is too small to hold all of the hairs.
What is your ear designed to do?
Detect, amplify and convert sound into an electrical signal.
What do eardrums do?
Vibrate.
What do ossicles do?
Vibrate.
