Question

Electrons in an atom occupy stationary orbits of fixed energy at different distances from the nucleus was proposed by:

• A. J.J. Thomson
• B. Sommerfeld
• C. Niels Bohr
• D. Albert Einstein

Answer 1

The correct option is C Niels Bohr

Niels Bohr proposed that electrons in an atom occupy stationary orbits of fixed fixed energy at different distances from the nucleus.
When an electron jumps from a lower energy state (ground state) to higher energy state (excited state) it absorbs energy.
When the electron comes back from higher to lower energy state, it releases energy.