character: Mr. Lee
topic: Energy in Mechanical Waves
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Wave Properties and Energy Transfer
grade: 9
subject: Physics
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character: Mr. Smith
topic: Understanding Sound Waves and Energy
grade: 9
subject: Physics
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character: Ms. Patel
topic: Mechanical Waves: Types and Energy Relations
grade: 9
subject: Physics
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