character: Dr. Johnson
topic: Ultrasonic Imaging Techniques
grade: 11
subject: Physics
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character: Dr. Smith
topic: Sound Waves and Their Applications
grade: 11
subject: Physics
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character: Ms. Lee
topic: Basics of Wave Propagation
grade: 11
subject: Physics
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character: Mr. Patel
topic: Applications of Ultrasound in Medicine
grade: 11
subject: Physics
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