character: Ms. Johnson
topic: Applications of Sound Waves
grade: 9
subject: Physics
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character: Mr. Thompson
topic: Understanding Sound Propagation
grade: 9
subject: Physics
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character: Dr. Lee
topic: The Science of Music and Sound Waves
grade: 9
subject: Physics
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character: Ms. Garcia
topic: Sound Waves in Everyday Technology
grade: 9
subject: Physics
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