12.7 (a) Using the Bohr’s model calculate the speed of the electron in a hydrogen atom in the n = 1, 2, and 3 levels. (b) Calculate the orbital period in each of these levels.

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    Vishal Baghel | Contributor-Level 10

    7 months ago

    12.7 Let v 1 be the speed of the electron of the hydrogen atom in the ground state level, n 1 = 1 . For charge e of an electron, v 1 is given by the relation

    v 1 = e 2 n 1 4 ? ? 0 ( h 2 ? ) = e 2 2 n 1 ? 0 h

    w h e r e , e = 1.6 * 10 - 19

    ? 0 = Permittivity of free space = 8.85 * 10 - 12 N - 1 C 2 m - 2

    h = Planck's constant = 6.626 Js * 10 - 34

    H e n c e v 1 = e 2 2 n 1 ? 0 h ( 1.6 * 10 - 19 ) 2 2 * 1 * 8.85 * 10 - 12 * 6.626 * 10 - 34 = 2.182 * 10 6 m/s

    For level 2, n 2 = 2 ,

    v 2 = e 2 2 n 2 ? 0 h = ( 1.6 * 10 - 19 ) 2 2 * 2 * 8.85 * 10 - 12 * 6.626 * 10 - 34 = 1.091 * 10 6 m/s

    For level 3, n 3 = 3 ,

    v 3 = e 2 2 n 3 ? 0 h = ( 1.6 * 10 - 19 ) 2 2 * 3 * 8.85 * 10 - 12 * 6.626 * 10 - 34 = 0.727 * 10 6 m/s

    Let be the orbital period of the electron when it is in level . Orbital period is given by the expression

    T 1 = 2 ? r 1 v 1 where r 1 = radius of the orbit = n 1 2 h 2 ? 0 ? m e 2 , where

    m = mass of an electron = 9.1 * 10 - 31 kg

    e = 1.6 * 10 - 19 C

    ? 0 = Permittivity of free space = 8.85 * 10 - 12 N - 1 C 2 m - 2

    h = Planck's constant = 6.626 * 10 - 34 Js

    T 1 = 2 ? v 1 * n 1 2 h 2 ? 0 ? m e 2 = 2 * n 1 2 * h 2 * ? 0 v 1 * m * e 2 = 2 * 1 * ( 6.626 * 10 - 34 ) 2 * 8.85 * 10 - 12 2.182 * 10 6 * 9.1 * 10 - 31 * ( 1.6 * 10 - 19 ) 2 = 7.77 * 10 - 78 5.083 * 10 - 62

    =1.53 * 10 - 16 s

    For level n 2 =2, T 2 = 2 * n 2 2 * h 2 * ? 0 v 2 * m * e 2 = 2 * 4 * ( 6.626 * 10 - 34 ) 2 * 8.85 * 10 - 12 1.091 * 10 6 * 9.1 * 10 - 31 * ( 1.6 * 10 - 19 ) 2 = 3.108 * 10 - 77 2.542 * 10 - 62 =

    ...more

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