character: Mr. Lee
topic: The Nature of Sound: An Introduction to Physics
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Waves and Their Properties
grade: 9
subject: Physics
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character: Dr. Smith
topic: Understanding Sound Waves
grade: 9
subject: Physics
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character: Mr. Thompson
topic: Vibration and Sound: The Basics
grade: 9
subject: Physics
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