Question

What is the experimental evidence in support of the idea that electronic energies in an atom are quantised?
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Answer 1

 
Rutherford summarised that the electrons in an atom revolved around the nucleus. However, as pointed out by Neils Bohr, the electrons should have collided into the nucleus on account of the continuous radiation emitted due to an accelerating charged particle.

 
Keeping this in mind, Bohr proposed the existence of quantised electronic energy states inside an atom.

Answer 2

ANSWER

The bright line spectrum shows that the energy levels in an atom are quantized.



These lines corresponds to definite wavelenghts and

are obtained as a result of electronic transitions between the energy levels

. Hence, the electrons in these levels have quantized values.


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