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Draw a neat, labelled energy level diagr...

Draw a neat, labelled energy level diagram for H atom showing the transitions.
Explain the series of spectral lines for H atom. Whose fixed inner orbit numbers are 3 and 4 respectively.
The work function for potassium and caesiumare 2.25 eV and 2.14 eV respectively. Is the photoelectric effect possible for either of them if incident wavelength is 5180 Å ?
[Given : Planck's constant `=6.63 xx 10^(-34) J.s.`, Velocity of light `=3xx10^(8)m//s, 1 eV =1.6xx10^(-19)J`]

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Energy level diagram ( schematic) for hydrogen atom and the first five spectral series
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