1. Sound Waves

2. Watch this https://youtu.be/y9UMODgsIUM
After watching the video, draw the movement of sound that you witnessed. (use arrows/labels to explain)

3. Sound Sound begins with a vibration.
Sound waves are compressional waves formed from vibrating objects colliding with air molecules.
Air is a medium, therefore sound waves would be classified as mechanical waves.

4. Speed of Sound
The speed of sound depends on temperature and the state of the medium.
Sound travels faster in liquids and in solids because the molecules are closer together.
As medium temperature rises, molecules move faster conducting sound waves faster

5. How we hear Ears are sense organs that respond to sound.
Your ear converts sound waves into nerve impulses that your brain interprets.
The ear’s structure is designed to receive and transmit the sound waves.

6. Parts of the Ear The OUTER EAR The MIDDLE EAR The INNER EAR
Contains the pinna, ear canal and eardrum
The MIDDLE EAR
Contains 3 bones: hammer, anvil and stirrup
The INNER EAR
Contains the cochlea and auditory nerve

7. Hearing involves 4 stages:
Stage 1: Ear gathers compressional waves which vibrate a tough area called the eardrum.
Stage 2: The middle ear has 3 bones called the hammer, the anvil, and the stirrup which amplify sound waves.
Stage 3: The inner contains the cochlea which vibrates sending auditory nerve impulses to the brain.
Stage 4: The brain decodes and interprets nerve impulses.

8. Parts of the Ear

9. How It All Works

10. High vs Low Frequency
Pitch is how high or low a sound seems to be, which is related to the frequency of the sound wave.
Higher pitch sounds carry more energy and travel further into the cochlea.
Lower pitch sounds carry less energy and don’t travel as far into the cochlea.