character: Mr. Smith
topic: Introduction to Sound Waves
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Properties of Sound Waves
grade: 9
subject: Physics
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character: Dr. Adams
topic: The Physics of Acoustics
grade: 9
subject: Physics
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character: Mrs. Lee
topic: Sound Wave Behavior and Interference
grade: 9
subject: Physics
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