State Bohr’S Postulate of Hydrogen Atom Which Successfully Explains the Emission Lines in the Spectrum of Hydrogen Atom - Physics

Advertisement Remove all ads
Advertisement Remove all ads
Advertisement Remove all ads

State Bohr’s postulate of hydrogen atom which successfully explains the emission lines in the spectrum of hydrogen atom. Use Rydberg formula to determine the wavelength of Hα line. [Given: Rydberg constant R = 1.03 × 107 m−1]

Advertisement Remove all ads


Bohr’s third postulate successfully explains emission lines. It states that ‘Whenever an electron jumps from one of its specified non-radiating orbit to another such orbit, it emits or absorbs a photon whose energy is equal to the energy difference between the initial and final states’.



The Rydberg formula for the Balmer series is given as


‘R’ is a constant called the Rydberg constant and its value is 1.03 × 107 m−1.

The Hα-line of the Balmer series is obtained when an electron jumps to the second orbit (nf = 2) from the third orbit (ni = 3).






λ = 6.99 x 10-7 

λ = 699 x 10-2 x 10-7 

λ = 699 nm

The value of λ lies in the visible region.

Concept: Bohr’s Model for Hydrogen Atom
  Is there an error in this question or solution?
2014-2015 (March) Panchkula Set 3

      Forgot password?
View in app×