Question: please solve asap. An electron from certain higher orbit (x) upon de-excitation to first excited state of He forms a maximum of 6 spectral lines.

please solve asap. An electron from certain higher orbit (x) upon de-excitation to first excited state of He forms a maximum of 6 spectral lines. The wavelength associated with the electron in the above higher orbit x is observed to be:

(A) 8.31 A

(B) 11.63 A

(D) 13.3 A

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