character: Mr. Thompson
topic: Sound Waves and Their Characteristics
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Properties of Waves
grade: 9
subject: Physics
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character: Mr. Lewis
topic: Types of Sound Waves
grade: 9
subject: Physics
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character: Dr. Nguyen
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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