Atoms - Result Question 24

25. The energy of a hydrogen atom in the ground state is −13.6eV. The energy of a He+ion in the first excited state will be

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======= ####25. The energy of a hydrogen atom in the ground state is −13.6eV. The energy of a He+ion in the first excited state will be

c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) −13.6eV

(b) −27.2eV

(c) −54.4eV

(d) −6.8eV

[2010]

Show Answer

Answer:

Correct Answer: 25. (a)

Solution:

  1. (a) Energy of a H-like atom in it’s nth  state is given by

En=−Z2×13.6n2eV

For, first excited state of He+,n=2,Z=2

∴EHe+=−422×13.6=−13.6eV

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