character: Dr. Johnson
topic: Wave-Particle Duality of Light
grade: 9
subject: Physics
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character: Albert Einstein
topic: Photoelectric Effect and Light
grade: 9
subject: Physics
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character: Niels Bohr
topic: Quantum Theory and Atomic Structure
grade: 9
subject: Physics
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character: Max Planck
topic: Quantum Theory and Energy Quanta
grade: 9
subject: Physics
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