A Li^{2+} ion (Z = 3) has an electron in the n = 3 orbit. The ion absorbs a photon and the electron jumps to the n = 5 orbit. (i) Calculate the minimum wavelength of the photon required for this transition. (ii) After the transition the electron is ionised from the n = 5 level; the excess energy appears as kinetic energy of the freed electron. Determine this kinetic energy. (Use (hc = 1240\, ext{eV·nm}\)).

Question

A Li^{2+} ion (Z = 3) has an electron in the n = 3 orbit. The ion absorbs a photon and the electron jumps to the n = 5 orbit. (i) Calculate the minimum wavelength of the photon required for this transition. (ii) After the transition the electron is ionised from the n = 5 level; the excess energy appears as kinetic energy of the freed electron. Determine this kinetic energy. (Use (hc = 1240\,	ext{eV·nm}\)).

Accepted Answer

λ = 1.43×10^2 nm; K.E. = 3.81 eV

Neco Model Questions Vol1 2024 Physics Question 16

Answer Options

About This Question

Master the Exam!