character: Mr. Thompson
topic: Understanding Sound Propagation
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Reflection and Refraction of Sound
grade: 9
subject: Physics
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character: Dr. Lee
topic: The Speed of Sound in Different Media
grade: 9
subject: Physics
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character: Mr. Garcia
topic: Doppler Effect and Sound Waves
grade: 9
subject: Physics
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