Sound is a type of energy that moves through matter as longitudinal vibrations, which are compressions and rarefactions that cause particles in solids, liquids, and gases to vibrate back and forth rapidly. The vibrations move energy through the medium in the same direction as the vibration. Sound travels through solids the fastest and gases the slowest. The amplitude of sound waves determines how dense the particles are during compression and rarefaction and is measured in decibels. The pitch of a sound refers to whether it is a high or low note.

1. Whatarethe
propertiesof
sound?
Chapter 12: Lesson 2:

2. Play a guitar.
What do you hear?

3. Is a type of energy we
hear.
Sound

4. Moves quickly back and
forth.
Vibrates

5. Compression
Rarefaction

6. Sound Waves
Vibrations that move
through matter

7. Direction of sound
Direction of energy

8. Sound waves moves in the
same direction the energy is
moving in.
Longitudinal
Waves

9. Waves that move in a different
direction.
Transverse
Waves

10. Sounds travel through 3 media.
- Sound travels through the solid the fastest
(energy passed through closely packed particles)
- Sound travels through the gases the
slowest.

11. Amplitude
How dense is the particles during
compressions and rarefactions.
Units:
Decibels (dB)

12. When you are TALKING the sound waves
will look like this
When you are SCREAMING the sound waves
will look like this
When you are WHISPERING the sound
waves will look like this

13. Humans hearing range.

14. Musical notes can be:
High notes Low notes
How high or low sound is.
Pitch