MHTCET 2016 Physics Solved Paper

(a) According to Bohr's theory, the wavelength of radiation emitted is given by

1

λ

=R[

1

n12

−

1

n22

]
As the energy difference ΔE=E5−E4 is very small, so minimum wavelength will take place for transition of electron from n = 5 to P = 4