What are
the
properties
of sound?
Chapter 12: Lesson 2:
Play a guitar.

What do you hear?
Sound
Is a type of energy we
hear.
Vibrates
Moves quickly back and
forth.
Compression
Rarefaction
Outer ear

Inner ear

Ear drum

Middle ear
Sound Waves
Vibrations that move
through matter
Direction of sound

Direction of energy
Sound waves moves in the
same direction the energy is
moving in.

Longitudinal
Waves
Waves that move in a different
direction.

Transverse
Waves
Sounds travel through 3 media.

- Sound travels through the solid the fastest
(energy passed through closely packed partic...
What is an echo?
Echo are sound waves that are reflected
back.
(When the sound wave hits a flat, firm
surface)
How can echo or noise be
reduced?
By covering the room with soft, thick, uneven
material.

Floor foam

Wall padding

Wood ...
How does covering rooms with the above
materials help?

When a sound wave hits the material the
sound is absorbed (changes...
Frequency
The number of times an object vibrates per
second.
Unit:
Hertz (Hz).
Musical notes can be:
High notes

Low notes

Pitch
How high or low sound is.
Low pitch
sounds has
lower
frequency.
High pitch
sounds has
higher
frequency.
Is there a difference between
pitch and frequency?
YES!!!
Pitch is the way our ears hear sound.
(The way we hear sound is ...
How to change pitch?

High pitch
Short guitar string

Vibrates fast
causing high pitch
Low pitch
Long guitar string

Vibrates slowly
causing low pitch
If you are standing still the sound waves will
sound normal
If the source of sound is moving towards
you, you will hear more vibrations.

So the sound
you are
hearing
becomes high
pi...
If the source of sound is moving away from
you, you will hear less vibrations.

So the sound you are hearing
becomes low p...
When sound frequency changes due to
moving towards or away from the sound.

The Doppler
effect.
When you are TALKING the sound waves
will look like this

When you are SCREAMING the sound waves
will look like this
When ...
Amplitude
How dense is the air during compressions
and rarefactions.

Units:
Decibels (dB)
Humans hearing range.
Ch.12.less.2.what are the properties of sound [autosaved] [recovered]
Ch.12.less.2.what are the properties of sound [autosaved] [recovered]
Ch.12.less.2.what are the properties of sound [autosaved] [recovered]
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Ch.12.less.2.what are the properties of sound [autosaved] [recovered]

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Ch.12.less.2.what are the properties of sound [autosaved] [recovered]

  1. 1. What are the properties of sound? Chapter 12: Lesson 2:
  2. 2. Play a guitar. What do you hear?
  3. 3. Sound Is a type of energy we hear.
  4. 4. Vibrates Moves quickly back and forth.
  5. 5. Compression Rarefaction
  6. 6. Outer ear Inner ear Ear drum Middle ear
  7. 7. Sound Waves Vibrations that move through matter
  8. 8. Direction of sound Direction of energy
  9. 9. Sound waves moves in the same direction the energy is moving in. Longitudinal Waves
  10. 10. Waves that move in a different direction. Transverse Waves
  11. 11. 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.
  12. 12. What is an echo? Echo are sound waves that are reflected back. (When the sound wave hits a flat, firm surface)
  13. 13. How can echo or noise be reduced? By covering the room with soft, thick, uneven material. Floor foam Wall padding Wood panels Wall art
  14. 14. How does covering rooms with the above materials help? When a sound wave hits the material the sound is absorbed (changes to thermal energy). Absorption: Transfer of energy when a wave disappears into a surface.
  15. 15. Frequency The number of times an object vibrates per second. Unit: Hertz (Hz).
  16. 16. Musical notes can be: High notes Low notes Pitch How high or low sound is.
  17. 17. Low pitch sounds has lower frequency. High pitch sounds has higher frequency.
  18. 18. 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)
  19. 19. How to change pitch? High pitch Short guitar string Vibrates fast causing high pitch
  20. 20. Low pitch Long guitar string Vibrates slowly causing low pitch
  21. 21. If you are standing still the sound waves will sound normal
  22. 22. If the source of sound is moving towards you, you will hear more vibrations. So the sound you are hearing becomes high pitched.
  23. 23. If the source of sound is moving away from you, you will hear less vibrations. So the sound you are hearing becomes low pitched.
  24. 24. When sound frequency changes due to moving towards or away from the sound. The Doppler effect.
  25. 25. 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
  26. 26. Amplitude How dense is the air during compressions and rarefactions. Units: Decibels (dB)
  27. 27. Humans hearing range.
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