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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
An electron in a hydrogen atom in its ground state absorbs $2$ times as much energy as the minimum required for it to escape from the atom. The kinetic energy of the emitted electron is ............ $\mathrm{eV}$
  • ✓
    $13.6$
  • B
    $20.4$
  • C
    $6.8$
  • D
    $27.2$
✓

Answer

Correct option: A.
$13.6$
a
The minimum energy required to escape $(I.E.)$
$= 13.6\, eV$
So the total absorbed energy is
$= 2 \times 13.6\, eV$
$= 27. 2 \,eV$
The kinetic energy of ejected electron is
$= 27.2 -13.6\, eV$
$= 13.6 \,eV$

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