1. Sound 12.1 Sound is one type of wave. 12.2
CHAPTER
NEW CHAPTER
Sound
the BIG idea
The ear responds to sound waves.
12.1
Sound is one type of wave.
12.2
People produce and detect sound waves.
12.3
The ear responds to sounds.
CHAPTER OUTLINE
CHAPTER RESOURCES

2. Sound is one type of wave.
12.1
Sound is one type of wave.
CALIFORNIA
Content Standards
7.5.g Students know how to relate the structures of the eye and ear to their functions.
wave
sound
medium
frequency
hertz
wavelength
CHAPTER
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SECTION
OUTLINE

3. Sound is one type of wave.
12.1
Sound is one type of wave.
Sound is a longitudinal wave that travels through a material medium, such as air.
wave
sound
medium
frequency
hertz
wavelength
CHAPTER
RESOURCES
SIMULATION
Explore how sound travels through air.
SECTION
OUTLINE

4. People produce and detect sound waves.
12.2
People produce and detect sound waves.
CALIFORNIA
Content Standards
7.5.g Students know how to relate the structures of the eye and ear to their functions.
pitch
outer ear
eardrum
middle ear
inner ear
CHAPTER
RESOURCES
SECTION
OUTLINE

5. People produce and detect sound waves.
12.2
People produce and detect sound waves.
A sound wave with a lower frequency and longer
wavelength is perceived to have a lower pitch.
pitch
outer ear
eardrum
middle ear
inner ear
A sound wave with a higher frequency and shorter
wavelength is perceived to have a higher pitch.
CHAPTER
RESOURCES
SECTION
OUTLINE

6. People produce and detect sound waves.
12.2
People produce and detect sound waves.
A sound wave with a lower frequency and longer
wavelength is perceived to have a lower pitch.
pitch
outer ear
eardrum
middle ear
inner ear
A sound wave with a higher frequency and shorter
wavelength is perceived to have a higher pitch.
VISUALIZATION
See the process of hearing in action.
CLASSZONE.COM
CHAPTER
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SECTION
OUTLINE

7. The ear responds to sounds.
12.3
The ear responds to sounds.
CALIFORNIA
Content Standards
7.5.g Students know how to relate the structures of the eye and ear to their functions.
decibel
CHAPTER
RESOURCES
SECTION
OUTLINE

8. The ear responds to sounds.
12.3
The ear responds to sounds.
The fluid-filled cochlea transfers sound waves in the inner ear into electrical signals that are then transmitted by nerves to the brain.
decibel
CHAPTER
RESOURCES
When air is more compressed, the pressure and energy are greater and the sound you hear is loud.
SECTION
OUTLINE

9. 12.1 Sound is one type of wave. I. Sound is one type of wave.
A. Sound is a pressure wave.
sound
B. Moving air carries sound waves.
medium
1. Longitudinal Waves
frequency
hertz
2. Transverse Waves
wavelength
C. Sound needs a medium to travel.
D. Sound and other waves have measurable properties.
CHAPTER
RESOURCES
E. Frequency, wavelength, and speed are related.
KEY CONCEPT
SUMMARY

10. People produce and detect sound waves.
12.2
People produce and detect sound waves.
II. People produce and detect sound waves.
pitch
A. Faster vibrations produce higher frequencies.
outer ear
B. Humans can hear a wide range of frequencies.
eardrum
middle ear
C. The human ear has three main parts.
inner ear
CHAPTER
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KEY CONCEPT
SUMMARY

11. The ear responds to sounds.
12.3
The ear responds to sounds.
III. The ear responds to sounds.
decibel
A. Air pressure moves the eardrum.
1. Detecting Sound
2. Levels of Sound
B. Loudness affects the ear.
1. Response of the Ear
2. Controlling Sound
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KEY CONCEPT
SUMMARY

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