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Light as particles, matter as waves — the photon and the de Broglie wavelength.
The strangest turn in physics: light arrives in particle-like photons and electrons travel as waves. Shine light of different colours on a metal to eject photoelectrons and measure the stopping potential to find Planck's constant, diffract an electron beam to reveal its de Broglie wavelength, build up an interference pattern one particle at a time, and read an X-ray tube's sharp cut-off wavelength — the experiments that forced quantum theory.
Beyond the open showcase, subscribed schools get the growing library of Dual Nature of Radiation experiments — searchable, tagged by concept and difficulty, and expanding continuously.