Which one of the following scientists mentioned that an electron in an

Which one of the following scientists mentioned that an electron in an atom could revolve in certain stable orbits without the emission of radiant energy ?

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Ernest Rutherford

J.J. Thomson

Niels Bohr

Albert Einstein

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UPSC NDA-1 – 2024

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Niels Bohr proposed a model of the atom in 1913 to explain the stability of atoms and the emission spectra of elements like hydrogen. One of his key postulates was that electrons orbit the nucleus in certain specific, stable orbits (also called stationary states) without emitting electromagnetic radiation. This addressed the problem in Rutherford’s model, where orbiting electrons were expected to lose energy continuously and spiral into the nucleus according to classical electromagnetism.

– Rutherford’s model suggested electrons orbit the nucleus but didn’t explain atomic stability.
– Classical physics predicted orbiting electrons would radiate energy and spiral into the nucleus.
– Niels Bohr proposed quantized orbits where electrons do not radiate energy, leading to stable atoms.

J.J. Thomson discovered the electron and proposed the plum pudding model. Ernest Rutherford conducted the gold foil experiment, leading to the discovery of the atomic nucleus and the nuclear model. Albert Einstein contributed significantly to physics, including the theory of relativity and the photoelectric effect, but the specific postulate about stable electron orbits without radiation is attributed to Bohr.

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