character: Dr. Frequency
topic: Exploring the Nature of Sound Waves
grade: 9
subject: Physics
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character: Sound Scientist
topic: Understanding Wave Properties
grade: 9
subject: Physics
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character: Echo Explorer
topic: Reflections and Sound
grade: 9
subject: Physics
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character: Harmonic Hero
topic: Frequency and Pitch Relationship
grade: 9
subject: Physics
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