Neco Model Questions Vol1 2022 Physics Question 4
Practice objective / multiple choice question 4 from the 2022 Neco Model Questions Vol1 Physics examination.
A hydrogen‑like ion of atomic number \(Z = 3\) (i.e., \(\mathrm{Li}^{2+}\)) has its single electron in the orbit \(n = 4\). (a) Calculate the radius of this orbit (in ångströms). (b) Find the wavelength of the photon emitted when the electron makes a transition from \(n = 4\) to \(n = 2\). Use the Bohr model with \(a_0 = 0.529\) Å and \(13.6\) eV as the hydrogen ground‑state energy. Give the wavelength in nanometres to two decimal places.
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This is Neco Model Questions Vol1 2022 Physics Question 4. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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