(i)State Bohr postulate of hydrogen atom that gives the relationship for the frequency of emitted photon in a transition.
(ii)An electron jumps from fourth to first orbit in an atom. How many maximum number of spectral lines can be emitted by the atom ?To which series these lines correspond?

1. According to Bohr's theory,energy is quantized,that is for each orbital,the energy corresponding is n multiple of a constant.
 So, as E = hν,we can find the frequency of transition.

2. There will be four spectral lines and they correspond to Bracket.

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