character: Mr. Johnson
topic: How Sound Waves Travel Through Different Mediums
grade: 9
subject: Physics
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character: Ms. Smith
topic: The Properties of Sound Waves
grade: 9
subject: Physics
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character: Dr. Lee
topic: The Speed of Sound in Various Materials
grade: 9
subject: Physics
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character: Mr. Thompson
topic: Understanding Sound Wave Reflection and Refraction
grade: 9
subject: Physics
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