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

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Presentation transcript:

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

Vibrations, Waves, and Sound Sound 21.1 Properties of Sound 21.2 Sound Waves 21.3 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. 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 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

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