character: Mr. Johnson
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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character: Ms. Smith
topic: Ultrasound Imaging Applications
grade: 9
subject: Physics
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character: Mr. Lee
topic: Acoustic Levitation and Its Uses
grade: 9
subject: Physics
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character: Dr. Brown
topic: Sound Waves in Engineering Design
grade: 9
subject: Physics
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