Point 23 of 27 — Lesson 1: Hydrogen Atomic Emission Spectrum and Production of X-RaysQuestion bank: 1 questions (1 with pictures)
23Ionisation, excitation and de-excitation
Excitation energy from the ground state to level n: En− E₁. For n = 2: 10.2 eV (first excitation energy). For n = 3: 12.09 eV.
Ionisation energy from the ground state = 13.6 eV, from level n: 13.6/n² eV.
A free electron colliding with an atom can excite it if its kinetic energy is at least the excitation energy; a photon needs exactly the energy difference, but a photon with energy larger than 13.6 eV can ionise an atom, with the surplus becoming the kinetic energy of the freed electron (like the photoelectric effect, with the ionisation energy playing the role of the work function).
📝 Question bank for this point
1 questions linked to this point only, 1 of them with pictures.
