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  1. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

    2. A.

     5x/36
    B.

     5x
    C.

     7.2 x
    D.

     x/6

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    Answer : Option A

    Explanation :

    The ionisation energy for the hydrogen atom can be written as:
    Ionisation energy = energy in first orbit - energy in infinite orbit
    Ionisation energy = ​ E = -E0 / n2 , where E0  = 13.6 eV (1 eV = 1.602×10-19  Joules) and n = 1,2,3… and so on.
    The difference in energy = Einfinity - E1
    so the ionisation energy from the ground state = x KJ = 0-( -E0 /12 ) = E0
    The energy required to jump the elctron from second to the third stage is: 

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