character: Wave Propagation Specialist
topic: Interaction of Sound Waves with Density Changes
grade: 9
subject: Physics
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character: Acoustic Engineer
topic: Effects of Medium Density on Sound Speed
grade: 9
subject: Physics
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character: Physics Teacher
topic: Principles of Sound Wave Behavior in Different Media
grade: 9
subject: Physics
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character: Research Scientist
topic: Understanding Sound Wave Reflection and Refraction
grade: 9
subject: Physics
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