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 10 Question-answer on models of atoms 1.        In an atom, the two electrons move round the nucleus in circular orbits of radii R and 4R. The ratio of the times taken by them to complete one revolution is: (a)     ¼ (b)    4/1 (c)     8/1 (d)    1/8 Ans: (d) 2.        The ratio of the energies of the hydrogen atom in its first to second excited states is: (a)     ¼ (b)    4/9 (c)     9/4 (d)    4. Ans: (c) 3.        For the principle quantum number n=4, the total number of different possible values of the azimuthal quantum number l, is (a)     2 (b)    8 (c)     4 (d)    3. Ans: (c) 4.        Consider the spectral line resulting from the transition n=2 to n=1 in the atoms and the...