character: Mr. Lee
topic: Acoustic Properties of Materials
grade: 9
subject: Physics
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character: Ms. Thompson
topic: Sound Waves and their Characteristics
grade: 9
subject: Physics
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character: Mr. Patel
topic: Material Density and Sound Transmission
grade: 9
subject: Physics
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character: Dr. Kim
topic: The Science of Sound Insulation
grade: 9
subject: Physics
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