All of it was driven by a flood of experimental results that were not compatible with classical physics.
See "Ultra Violet Catastrophe" in black body radiation, photo effect.
Planck famously performed curve fitting on the black body spectrum and only afterwards found the theoretical foundation for the function that fit the data.
All of it was driven by a flood of experimental results that were not compatible with classical physics.
See "Ultra Violet Catastrophe" in black body radiation, photo effect.
Planck famously performed curve fitting on the black body spectrum and only afterwards found the theoretical foundation for the function that fit the data.
https://en.wikipedia.org/wiki/Ultraviolet_catastrophe