Ch.12.less.2.what are the properties of sound -

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. Frequency
The number of times a particle vibrates per
second.
Unit:
Hertz (Hz).

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

13. Low pitch
sounds has
lower
frequency.
High pitch
sounds has
higher
frequency.

14. Is there a difference between pitch and frequency?
YES!!!
Pitch is the way our ears hear sound.
(The way we hear sound is related to the
number of peaks BUT, they are not the
same thing)

15. How to change pitch?
High pitch
Short guitar string
Vibrates fast
causing high pitch

16. Low pitch
Long guitar string
Vibrates slowly
causing low pitch

17. 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

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

19. Humans hearing range.