Photoelectric Effect Experiment

The Photoelectric Effect Experiment provided critical evidence that light behaves as quantized particles, reshaping quantum theory. Building on Einstein's 1905 explanation, Robert Millikan's 1916 measurements confirmed Planck's constant as 6.626×10⁻³⁴ J·s to within 99.5% accuracy, with stopping voltage for sodium revealing a work function of 2.3 eV. This experiment outperforms #5 Millikan Oil Drop Experiment in profoundness because it directly validated Einstein's quantum hypothesis, earning him the Nobel Prize. The photoelectric effect now powers everyday devices from solar panels to digital cameras.