Does Bohr Model Contradict Classical Physics?

[Yael]

a question asks if the Bohr model contredicts in any way classical physics.

i replied that only the first assumption that the electrons are fixed in circular orbits violates the laws of classical mechanics - of the idea of centripetal acceleration (?)
am i right to say that?
did i miss anything else? :-S

 

[lightgrav]

What do you mean? The Bohr Model REQUIRES centripetal acceleration
(caused by electric attractive Force) to obtain these circular orbits.

The Bohr Model (as any other model) ADHERES TO classical Physics,
and imposes ADDITIONAL limitations, restrictions, or conditions ...
in particular, each electron must extend all the way around the orbit.
(otherwise the changing Electic & magnetic fields would radiate Energy.)

Textbook authors like to treat the "non-radiating electron orbit" statement
as a restriction on "allowed" orbits, rather than as describing an electron.
But in doing so, they hide the explanation of why some orbits don't radiate,
and they do not foreshadow the deBroglie wavelength analysis.

 

[kyle8921]

Yes, you are correct in stating that the first assumption of the Bohr model, which states that electrons are fixed in circular orbits around the nucleus, contradicts classical physics. This is because in classical physics, electrons are expected to lose energy and spiral into the nucleus due to the emission of electromagnetic radiation.

However, there are other aspects of the Bohr model that are consistent with classical physics, such as the conservation of energy and the quantization of energy levels. In fact, the Bohr model can be seen as a bridge between classical physics and quantum mechanics.

Some other potential contradictions between the Bohr model and classical physics could include the concept of wave-particle duality and the uncertainty principle. These concepts were not fully understood or accepted in classical physics, but are integral to the Bohr model and quantum mechanics in general.

Overall, while there may be some contradictions between the Bohr model and classical physics, it is important to recognize that the Bohr model was a significant step in the development of quantum mechanics and helped to bridge the gap between classical and quantum physics.