Chemistry · Bohr model of a hydrogen atom: its postulates, derivation of the relations for the energy of the electron and radii of the different orbits, limitations of Bohr's model
How many lines in the spectrum will be observed when electrons return from 7 th
How many lines in the spectrum will be observed when electrons return from 7 th shell to 2nd shell?
- A. 13
- B. 14
- C. 15
- D. 16
Step-by-step solution
The number of spectral lines when an electron transitions from a higher shell (n=7) to a lower shell (m=2) is given by the formula (n-m+1)(n-m)/2 = (7-2+1)(7-2)/2 = (6×5)/2 = 15. This counts all possible transitions between any two energy levels from 7 down to 2, including direct and indirect jumps.
Related MCQs
- Rutherfords alpha particle scattering experiment concluded that:…
- Which of the following was not explained by Bohr's atomic model…
- In a certain Bohr orbit, the total energy is For this orbit, the kinetic energy, and potential energy are respectively:…
- The frequency of in the first Bohr orbit in a H-atom is:…
- Some hydrogen-like atom in ground state absorb photons having the same energy and on de-excitation, it emits exactly photons. Then the energ…