Using Bohr's postualtes , derive the expression for the frequency of radiation emitted when electron in hydrogen atom undergoes transition from higher energy state ( quantum number `n_(i)` ) to the lower state `(n_(f))` .
When electron in hydrogen atom jumps from energy state `n_(i) = 4 ` to ` n_(f) = 3,2,1` identify the spectral series to which the emission lines belong .

Explanation

First give answer in Short Answer Question Number 32 and obtainn expression for the energy of an electron `E = - ( me^(4))/(8 in_(0)^(2) n^(2) h^(2))` . After that write the answer give in Short Answer Questions Number 34 for frequency of spectral lines and spectral series of hydrogen spectrum .