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1. 19. Quantum Physics Lesson 1 - Photo-Electric Effect [2026] - Mr DK
2. 19. Quantum Physics Lesson 1 - Photo-Electric Effect [2026] - Dr Li
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![19. Quantum Physics Lesson 1 - Photo-Electric Effect [2026] - Dr Li](https://edutv.sg/public/uploads/17772003928172.png)