Problem 1:          Bohr’s atomic model can explain

(a)    the spectrum of hydrogen atom only

(b)    the spectrum of an atom or ion containing one electron only

(c)    the spectrum of hydrogen molecule

(d)    the solar spectrum

Solution:                 In Bohr’s theory while calculating the energy of electron, the potential energy has been found out by considering only the attraction between the electron and nucleus. If there is another electron in the orbit, the potential energy would change due electron-electron repulsion. Therefore the Bohr’s model is meant for all one-electron systems.

\ (b)