character: Ms. Johnson
topic: Sound Wave Technology in Communication Devices
grade: 9
subject: Physics
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character: Mr. Smith
topic: Introduction to Wave Properties
grade: 9
subject: Physics
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character: Mrs. Lee
topic: Applications of Sound Waves in Medicine
grade: 9
subject: Physics
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character: Dr. Patel
topic: Acoustics and Its Role in Technology
grade: 9
subject: Physics
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