Question : In which year did Niels Bohr propose a theory for the hydrogen atom based on the quantum theory that some physical quantities take only discrete values?
Option 1: 1919
Option 2: 1921
Option 3: 1909
Option 4: 1913
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Correct Answer: 1913
Solution : The correct answer is 1913.
In 1913, Niels Bohr introduced his quantum theory-based model for the hydrogen atom. The Bohr model, a groundbreaking contribution to atomic physics, was pivotal in comprehending electron behaviour in atoms through the concept of distinct energy levels.
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