character: Mr. Johnson
topic: Properties of Waves
grade: 9
subject: Physics
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character: Ms. Smith
topic: Wave Frequency and Wavelength
grade: 9
subject: Physics
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character: Dr. Lee
topic: Types of Waves: Transverse and Longitudinal
grade: 9
subject: Physics
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character: Mr. Brown
topic: Sound Waves and Their Properties
grade: 9
subject: Physics
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