character: Ms. Laura Kim
topic: Harmonics and Sound Frequency
grade: 9
subject: Physics
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character: Mr. John Smith
topic: Wave Properties and Energy Transfer
grade: 9
subject: Physics
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character: Dr. Emily Chen
topic: Sound Waves and Their Applications
grade: 9
subject: Physics
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character: Ms. Sarah Johnson
topic: Frequency Modulation and Sound Technology
grade: 9
subject: Physics
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