character: Mr. Brown
topic: Sound Waves and Their Properties
grade: 9
subject: Physics
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character: Mr. Smith
topic: Waves and Oscillations
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Characteristics of Sound
grade: 9
subject: Physics
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character: Dr. Lee
topic: Frequency and Amplitude of Waves
grade: 9
subject: Physics
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