Saved Bookmarks
| 1. |
22. The ground state energy of hydrogen atom is -136 eV. When its electron is in the first excited stateits excitation energy is [AIPMT (Prelims)-2008)(1) Zero(2) 3.4 eV(3) 6.8 eV(4) 10.2 eV |
|
Answer» wer is (4) 10.2eVwe know that, ENERGY of nth SHELL = -13.6 eV .....(I)So, energy of first shell(ground state) = -13.6eV ......(II)and first exitation state means electron is in 2ND shellthus using (I),energy of 2nd shell = -3.4eV .....(III)Now, Exitation energy for nth shell = (Energy of final shell - energy of INITIAL shell)thus the required exitation energy is = (III) - (II) = [-3.4 -(-113.6)]eV = 10.2eV |
|