character: Mr. Harris
topic: Sound Waves and Frequency
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Wave Properties and Behavior
grade: 9
subject: Physics
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character: Mr. Adams
topic: Fundamentals of Sound
grade: 9
subject: Physics
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character: Dr. Smith
topic: Frequency and Pitch in Music
grade: 9
subject: Physics
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