Chapter Objectives:

• Relate the pitch of a sound to its frequency.
• Describe the movement of sound through air.
• Compare the transmission of sound through air with that through solids, liquids, and a vacuum.
• Describe factors that affect the speed of sound.
• Describe loudness and sound intensity.
• Give examples of forced vibration.
• Describe natural frequency.
• Describe resonance.
• Describe how sound waves interfere with one another.
• Describe beats.

Chapter Terms:

• infrasonic
• untrasonic
• compression
• rarefaction
• forced vibration
• natural frequency
• resonance
• beats
• carrier wave
• modulation
• amplitude modulation (AM)
• frequency modulation (FM)

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Chapter Outline Framework:

• Origin of Sound
• Nature of Sound in Air
• Media that Transmit Sound
• Speed of Sound in Air
• Reflection of Sound
• Refraction of Sound
• Energy in Sound Waves
• Forced Vibrations
• Natural Frequency
• Resonance
• Interference
• Beats

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