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WORKSHEET-2(BOHR’S ATOMIC MODEL, BOHR’S THEORY OF HYDROGEN ATOM, SPECTRAL SERIES)




         1          The ground state energy of electron in case of     is

                    (a)13.6 eV                        (b)- 13.6 eV                        (c)30.4 eV                (d)-122.4 eV

         2          The ratio of radii of orbits corresponding to first and second excited states of hydrogen atom is
                    (a)1                                   (b)1:2                                   (c)2:3                        (d)4:9

         3          Which spectral series of hydrogen lie in UV region?
                    (a)Paschen                       (b)Lyman                             (c)Brackett               (d)Balmer

         4          According to Bohr ,angular momentum _______________in hydrogen atom is___________.

         5          Total energy of electron in any orbit of an atom is_______. This indicates that electron________.

         6          _______________series lies in the visible region.

         7          The energy of electron in ground state of hydrogen atom is -13.6 eV. How much energy is
                    required to take an electron in this atom from the ground state to first excited state?

         8          In a hydrogen atom , if the electron is replaced by a particle which is 200 times heavier but has
                    the same charge, how would its radius change?

         9          Explain the origin of different spectral lines of hydrogen spectrum on the basis of Bohr’s theory?

         10         (a)State the postulates of Bohr’s theory of atomic spectra.
                    (b)Hence obtain an expression for radii of permitted orbits  in the hydrogen atom.
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