character: Acoustic Analyst
topic: The Influence of Density on Sound Propagation
grade: 9
subject: Physics
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character: Sound Wave Explorer
topic: Effects of Medium on Sound Speed
grade: 9
subject: Physics
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character: Density Detective
topic: How Material Density Affects Acoustics
grade: 9
subject: Physics
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character: Wave Propagation Specialist
topic: Interaction of Sound Waves with Density Changes
grade: 9
subject: Physics
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