character: Ms. Harmony
topic: Understanding Sound Waves
grade: 9
subject: Physics
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character: Mr. Echo
topic: Reflection of Sound
grade: 9
subject: Physics
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character: Dr. Frequency
topic: Waves and Their Properties
grade: 9
subject: Physics
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character: Professor Resonance
topic: Resonance in Sound Waves
grade: 9
subject: Physics
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