character: Albert Einstein
topic: Photoelectric Effect
grade: 12
subject: History
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character: Max Planck
topic: Quantum Theory
grade: 12
subject: History
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character: Niels Bohr
topic: Atomic Model and Quantum Theory
grade: 12
subject: History
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character: Louis de Broglie
topic: Wave-Particle Duality
grade: 12
subject: History
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