character: Mr. John Smith
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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character: Ms. Emily Carter
topic: Ultrasound Imaging Techniques
grade: 9
subject: Physics
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character: Dr. Sarah Lee
topic: Acoustic Engineering in Architecture
grade: 9
subject: Physics
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character: Mr. Thomas Brown
topic: Sound Wave Applications in Music Technology
grade: 9
subject: Physics
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