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1.viii.1 Problems with the Classical Model of Atoms
In 1911, Ernst Rutherford discovered the atomic nucleus and posited that atoms consist of negatively charged electrons orbiting a positively charged nucleus under the electrostatic interaction, in a similar way to how planets orbit the sun under the gravitational interaction.
This is not compatible with classical physics because accelerating
1.viii.1 The Spectrum of Hydrogen
Putting the light emitted by atoms through a prism shows that atoms only emit and absorb radiation at a discrete set of wavelenghts