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Chapter 21

Chapter 21. Physics A First Course. Vibrations, Waves, and Sound. Vibrations, Waves, and Sound Sound. 21.1 Properties of Sound 21.2 Sound Waves 21.3 Sound, Perception and Music. Key Question: How do we know sound is a wave?. 21A Investigation: The Properties of Sound.

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Chapter 21

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  1. Chapter 21 Physics A First Course Vibrations, Waves, and Sound

  2. Vibrations, Waves, and SoundSound • 21.1 Properties of Sound • 21.2 Sound Waves • 21.3 Sound, Perception and Music

  3. Key Question: How do we know sound is a wave? 21A Investigation: The Properties of Sound *Students read text section 21.1 AFTER Investigation 21A

  4. 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.

  5. Explain how pitch, loudness, and speed are related to waves. Explain the Doppler effect. Describe how sound is created and recorded. Chapter 21.1 Objectives and Vocabulary • pitch • decibels • acoustics • subsonic • supersonic • shock wave • Doppler effect

  6. Complex sound is made from many frequencies.

  7. Common Sounds and their loudness(decibels)

  8. Speed of Sound • 330 m/sec • 660 mile/hr • faster in solids and liquids than in air

  9. reverberation Fourier's theorem 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 Chapter 21.2 Objectives and Vocabulary

  10. Key Question: How are the properties of waves used in the design of musical instruments? 21B Investigation: Wave Properties of Sound *Students read text section 21.3 AFTER Investigation 21B

  11. 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.

  12. frequency spectrum sonogram cochlea rhythm musical scale, note octave beat consonance dissonance 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. Learn about the role of harmonics in how instruments sound. Chapter 21.3 Objectives and Vocabulary

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