character: Mr. Johnson
topic: Sound Waves in Different Mediums
grade: 9
subject: Physics
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character: Ms. Smith
topic: Wave Propagation in Solids, Liquids, and Gases
grade: 9
subject: Physics
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character: Dr. Brown
topic: The Speed of Sound in Various Materials
grade: 9
subject: Physics
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character: Mrs. Lee
topic: Factors Affecting Sound Wave Transmission
grade: 9
subject: Physics
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