character: Mrs. Davis
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Acoustics in Architectural Design
grade: 9
subject: Physics
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character: Dr. Smith
topic: Ultrasound Technology in Medicine
grade: 9
subject: Physics
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character: Ms. Lee
topic: Sonar Systems in Marine Navigation
grade: 9
subject: Physics
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