character: Ms. Chen
topic: Light Emitting Diodes
grade: 9
subject: Physics
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character: Mr. Smith
topic: Semiconductors and their Applications
grade: 9
subject: Physics
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character: Dr. Lee
topic: Basics of Optoelectronics
grade: 9
subject: Physics
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character: Ms. Davis
topic: Energy Efficiency in Lighting
grade: 9
subject: Physics
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