AIIMS2019Physics-Atomic Structure
AIIMS 2019 Physics Bohr's Model MCQ Question
Type: MCQ-numerical-Medium-Class 12
If energy of 15 eV is given to electron in orbit then find it's final energy when it comes out of H⁻atom.
A
14.15 eV
B
13.6 eV
Correct Answer
Option A
Detailed Explanation
When an electron in the 4th orbit of a hydrogen anion (H⁻) absorbs 15 eV of energy, it initially has an energy of -0.85 eV (the energy of the 4th orbit). After absorbing this energy, the total energy becomes 15 eV - 0.85 eV = 14.15 eV. This energy is sufficient to overcome the binding energy of the electron, allowing it to escape the atom, resulting in a final energy of 14.15 eV. Options B and C are incorrect as they do not reflect the correct calculation of the electron's energy after absorption and escape.
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