character: Dr. Brown
topic: Sound Waves in Engineering Design
grade: 9
subject: Physics
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character: Mr. Smith
topic: Applications of Sound Waves in Architecture
grade: 9
subject: Physics
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character: Ms. Johnson
topic: The Physics of Sound in Material Science
grade: 9
subject: Physics
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character: Mr. Lee
topic: Acoustic Engineering and Design Principles
grade: 9
subject: Physics
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