Here's a breakdown:
1. Existing Problem: Scientists had observed that when hydrogen gas is heated, it emits light, but not a continuous spectrum. Instead, it emits light at specific, discrete wavelengths. This was a puzzle that classical physics couldn't explain.
2. Bohr's Model: Bohr proposed a model of the atom where electrons could only exist in specific energy levels, like steps on a ladder. When an electron jumps from a higher energy level to a lower one, it emits a photon of light with energy equal to the difference between the two levels. This explained the discrete lines in the hydrogen spectrum.
3. Experimental Validation: Bohr's model was successful in explaining the observed spectral lines of hydrogen, but it wasn't directly proven by an experiment he conducted. Instead, it was validated by the fact that it could accurately predict the wavelengths of the spectral lines.
4. Further Development: Bohr's model was later refined by quantum mechanics, which provided a more complete and accurate description of atomic structure.
In short, Bohr's theory wasn't proven by a single experiment, but by its ability to explain existing experimental data and predict new results. His model was a significant step forward in understanding the atom, paving the way for future developments in quantum physics.
