how to do this one first
The frequency of radiation emitted when the
electron falls from n = 4 to n = I in a hydrogen
atom will be (Given ionization energy of
H = 2.18 x 10-18 J atom-I and h = 6.625 x 10--34 Js)
(1) 1.54 x 1015 s-l
(2) 1.03 x 1015 s-l
(3) 3.08 x 1015 s-l
(4) 2.00 x 1015 s-l
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