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CBSE Class 11-science Answered

The energy required to dislodge electron from excited isolated H-atom,IE=13.6eV is

(1)=13.6eV

(2)>13.6eV

(3)<13.6eV and >3.4eV

(4)<3.4eV

Asked by shahrithik07 | 18 Oct, 2018, 05:26: PM
Expert Answer

Option (4) <3.4eV is correct.

E1 = 13.6 eV

Energy of the first orbit is -13.6 eV.

Energy space of space the space second space orbit space is space space straight E subscript 1 over straight n squared

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator negative 13.6 over denominator 4 end fraction

Energy space of space the space second space orbit space space equals space minus 3.4 space eV

The lowest excited state of the hydrogen atom has the electron in the second orbit, thus energy required is equal to 3.4 or less than 3.4 (≤3)

Answered by Varsha | 18 Oct, 2018, 07:15: PM
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