Hello candidate,

According to the hydrogen emission spectra and the laser emission spectra for metastable States, the expression for or energy in terms of wavelength is given by the formula-

E3- E2= hc/wavelength, where is E2 is given as 0.4* 10^-19 J, wavelength= 1.1*10^-3 m, so the value of hc/wavelength equals 1.8*10^-22 J, so the value of E3 (meta stable state) equals 0.4018*10^-19 Joules.

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