Find the quantum number ‘n’ corresponding to exciting state of He + ion if on transition to the ground state that ion emits two photons in succession with wavelength 1026.7 Å and 304 Å. (R = 1.096 × 10 7 / m)
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(6)
According to conservation of energy
= RchZ 2 
n = 6.03 quantum number = 6
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