character: Mr. Johnson
topic: Properties of Sound Waves
grade: 9
subject: Physics
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character: Ms. Lee
topic: Wave Behavior and Sound
grade: 9
subject: Physics
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character: Dr. Smith
topic: Frequency and Wavelength of Waves
grade: 9
subject: Physics
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character: Mr. Adams
topic: Applications of Sound Waves
grade: 9
subject: Physics
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