Consider the following four transitions in ahydrogen atom:(i) ni = 2, nf = 6 (ii) ni = 2, nf = 8(iii) ni = 7, nf = 8 (iv) ni = 6, nf = 2Find (a) the longest- and (b) the shortest-wavelength photon thatcan be emitted or absorbed by these transitions. Give the valueof the wavelength in each case. (c) For which of these transitionsdoes the atom lose energy? Explain.

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The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: