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Physics A First Course
Vibrations, Waves, and Sound
Chapter 21
Vibrations, Waves, and Sound
Sound
 21.1
 21.2
 21.3
Properties of Sound
Sound Waves
Sound, Perception and Music
21A Investigation: The Properties of Sound
Key Question:
How do we know sound is a wave?
*Students read text section 21.1 AFTER Investigation 21A
21A Investigation Topics

Identify the range of frequencies heard by the
class.

Conduct a survey and make a histogram of the
results.

Prove that sound is a wave.

Demonstrate why beats occur.

Find a mystery frequency.
Chapter 21.1 Objectives and Vocabulary

Explain how pitch, loudness,
and speed are related to waves.




Explain the Doppler effect.

Describe how sound is created
and recorded.

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
pitch
decibels
acoustics
subsonic
supersonic
shock wave
Doppler effect
Complex sound is made from many
frequencies.
Common Sounds and their loudness
(decibels)
Speed of Sound
 330
m/sec
 660
mile/hr
 faster
in solids
and liquids
than in air
Chapter 21.2 Objectives and Vocabulary

Learn how sound is made
and know the factors that
affect the speed of sound.
Know that the speed of
sound changes in different
materials.
 Recognize the importance of
the wavelength of sound.

Describe sound interactions.
 Compare the superposition
principle and Fourier's
theorem



reverberation
Fourier's
theorem
21B Investigation: Wave Properties of Sound
Key Question:
How are the properties of
waves used in the design of
musical instruments?
*Students read text section 21.3
AFTER Investigation 21B
21B Investigation Topics

Make a simple musical instrument.

Explain how a musical instrument controls
frequency and wavelength.

Produce complex sounds.

Identify the frequencies of musical notes.
Chapter 21.3 Objectives and Vocabulary

Describe how the meaning of
sound is related to frequency
and time.




Learn how we hear sound.

Describe the musical scale,
consonance, dissonance and,
beats in terms of sound waves.

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

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Learn about the role of
harmonics in how instruments
sound.


frequency
spectrum
sonogram
cochlea
rhythm
musical scale,
note
octave
beat
consonance
dissonance