現代物理

把光電效應、原子光譜、德布羅意物質波、波耳模型與放射性／半衰期留在同一條受限但誠實的現代物理分支上。

This topic stays intentionally compact for now. One module keeps the modern-physics turn anchored on a controllable lamp, metal surface, and collector so you can separate frequency from intensity, threshold from brightness, and stopping potential from emission rate. The next keeps an energy ladder and observed spectrum on one shared bench so discrete lines point toward quantized structure. de Broglie matter waves then add a compact momentum-to-wavelength bridge with one local spacing sketch and one fixed loop fit. The Bohr-model page specializes that evidence into hydrogen series, allowed transitions, and bounded historical orbit language while staying explicit that it is not the final quantum description. Radioactivity and Half-Life then keeps one bounded sample tray and linked decay curves in view so single-nucleus chance and large-sample regularity can be read honestly without turning the topic into a full nuclear-physics subsystem.