character: Dr. Smith
topic: Frequency and Pitch of Sound
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Properties of Waves
grade: 9
subject: Physics
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character: Ms. Lee
topic: Sound Waves and Their Characteristics
grade: 9
subject: Physics
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character: Professor Adams
topic: Understanding Sound Frequency and Its Human Perception
grade: 9
subject: Physics
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