character: Mr. Lewis
topic: Types of Sound Waves
grade: 9
subject: Physics
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character: Ms. Thompson
topic: Characteristics of Longitudinal Waves
grade: 9
subject: Physics
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character: Mr. Patel
topic: Comparison of Sound and Light Waves
grade: 9
subject: Physics
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character: Dr. Smith
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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