1. Sound Energy

2. What is sound? A form of mechanical energy made by vibrations.
When an object vibrates it causes the air particles around it to move.
These particles bump into particles close to them and this continues until they run out of energy.

3. Try This
Put your finger on your neck and say “aah” as loud as you can.
Now say it as soft as you can.
You can not only hear the sound, but you can feel the vibration inside your throat.

4. How sound is made Sound is made when a material vibrates
Sound waves are created by the movement of particles in a medium

5. How does sound travel
Mechanical waves need a medium to travel through.
Example of the mediums are: solid, liquid or gas.
Sound cannot travel in a vacuum.
No sound in space

6. How does sound travel
Sound passes through the medium as longitudinal waves.
When the vibrations are fast you hear a high pitch.
When they’re slow, you hear a low pitch.

7. How CAN WE CHANGE SOUND?
We can make it louder or softer by changing the amplitude of the height of the wave.
The higher the amplitude, the louder the sound. The lower the amplitude the softer the sound.

8. Divided into three major regions:
How do we hear sound
THE HUMAN EAR
Divided into three major regions:
Outer Ear
Visible portion of ear captures sound.
Middle Ear
Contains eardrum, hammer,
anvil, and stirrup.
Transfers sound from outer to inner ear.
Inner Ear
Contains Cochlea and auditory nerve, which leads to brain.

9. Different SOUNDs Different sounds produce different waves Flute
Trumpet
Violin
Clarinet

10. Did you know… Sound waves travel at 768 miles per hour.
Fast vibrations make a high sound while slow vibrations make a low sound.
Some animals hear things we cannot hear.
Thunder is one of nature’s loudest sounds.
Sound travels 4 times faster through water than through air.
There is no sound in space.
Geologists use their knowledge of how sound travels through rocks to help them find oil fields.

11. Let’s Review…