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+1 vote
22.2k views
in Chemistry by (2.8k points)

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

0 votes
by (15 points)
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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