character: Dr. Emma Chen
topic: Applications of Ultrasound in Medicine
grade: 11
subject: Physics
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character: Dr. Sarah Johnson
topic: Wave Properties and Medical Imaging
grade: 11
subject: Physics
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character: Dr. Mark Thomas
topic: Sound Waves and Their Uses in Healthcare
grade: 11
subject: Physics
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character: Dr. Rachel Lee
topic: Physics of Ultrasound Technology
grade: 11
subject: Physics
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