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In ground state of He ion how much energy is supplied to electron so that second line of balmer series is obtained in its spectrum:- 

(a)10.2eV (b)48.36eV (c)51eV (d)None of these
Please give the explanation.

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1 Answer

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E = 13.6 *  (1/ni^2 -1/nf^2) * z^2 eV

z = 2 ( atomic no. of Helium)

For Balmer series;

ni = 2 and nf = 4 (i.e. second line of balmer series)

E = 13.6 * (1/2^2 -1/4^2) * z^2 eV.

E = 10.2 eV.

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