character: Mr. Smith
topic: Wave Properties and Sound Transmission
grade: 9
subject: Physics
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character: Mr. Thomas
topic: Fundamentals of Sound Waves
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Exploring Wave Interference
grade: 9
subject: Physics
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character: Dr. Lee
topic: Applications of Sound in Technology
grade: 9
subject: Physics
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