20EP01
(b) The Bohr model for hydrogen can be applied to the singly-ionized helium atom. In this model the radius r , in m, of the orbit of the electron is given by r = 2.7 × 10–11 × n2 where n is a positive integer. (i) Show that the de Broglie wavelength λ of the electron in the n = 3 state is λ = 5.1 × 10–10 m. ................
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