The energies of three conservative energ...

The energies of three conservative energy levels `L_3,L_2` and `L_1` of hydrogen atom are `E_0`. `(4E_0)/9` and `E_0/4` respectively. A photon of wavelength `lambda` is emitted for a transition `L_3` to `L_1` .What will be the wavelength of emission for transition `L_2` to `L_1` ?

`(16lambda)/31`

`(27lambda)/7`

`19/20 lambda`

`lambda`

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