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Choose the correct statement regarding Bohr’s theory

Choose the correct statement regarding Bohr’s theory Correct Answer All are correct.

CONCEPT:

Bohr’s Model: Niels Bohr by making 4 postulates solved the puzzle of hydrogen spectra.

  • The electrons revolve around the nucleus in certain circular stable orbits without emitting electromagnetic radiations. 
  • The radius around the orbit has some special values of the radius. In these stationary orbits, they do not radiate energy as expected from Maxwell’s laws.
  • The energy of each stationary orbits are fixed, electrons can jump from a higher orbit to a lower orbit by emitting a photon of radiation. Where Higher energy orbit – Lower energy orbit = (h c)/λ
    • The electron can also jump from lower to higher energy by absorbing energy.
  • In stationary orbits, the angular momentum L of an electron always remains constant which is an integral multiple of (h/2π). 

Angular momentum (L) = m v r = n × (h/2π)

Angular momentum in 1st orbit = h/2π 

Angular momentum in 3rd orbit = 3h/2π 

EXPLANATION:

Important Points

Limitations of Bohr’s Model:

  • It could not work for atoms and ions having more than one electron not even for Helium.

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