alleryThe ionisation energy of the hydrogen atom is about:
A3.40 eV
B10.2 eV
C1.51 eV
D13.6 eV
Answer & Solution
Correct answer: D. 13.6 eV
1. This is the energy needed to free the electron entirely.
2. It is measured from the ground state.
3. Its value is 13.6 electron volts.
_Source: syllabus Physics Part II, Chapter 12, Atoms._
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