character: Mr. Chen
topic: Speed of Sound in Different Media
grade: 9
subject: Physics
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character: Mr. Lee
topic: Properties of Sound Waves
grade: 9
subject: Physics
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character: Ms. Wang
topic: Elasticity and Sound Transmission
grade: 9
subject: Physics
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character: Dr. Smith
topic: Comparative Speed of Sound in Solids, Liquids, and Gases
grade: 9
subject: Physics
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