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For a doubly ionised Li-atom...

For a doubly ionised Li-atom

A

Angular momentum of an electron in 3rd orbit is `"3h"/(2pi)`

B

Energy of electron in 2nd excited state is -13.6 eV

C

Speed of electron in 3rd orbit is `c/137`, where c is speed of light

D

Kinetic energy of electron is 2nd excited state is half of the magnitude of the potential energy

Text Solution

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A, B, C, D
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A doubly ionised Li atom is excited from its ground state(n = 1) to n = 3 state. The wavelengths of the spectral lines are given by lamda_(32), lamda_(31) and lamda_(21) . The ratio l_(32)//lamda_(31) and l_(21)//l_(31) are, respectively

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Knowledge Check

  • As par Bohr model, the minimum energy (in eV ) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is

    A
    `1. 51`
    B
    `13.6`
    C
    `40.8`
    D
    `122.4`

  • The ratio between acceleration of the electron in singly ionised helium atom and doubly ionised lithium atom (both in ground state ) is

    A
    `(4)/(9)`
    B
    `(27)/(8)`
    C
    `(8)/(27)`
    D
    `(9)/(4)`

  • If lambda is the wavelength of hydrogen atom from the transition n=3 to n=1 ,then what is the wavelength for doubly ionised lithium ion for same transition?

    A
    `lambda/3`
    B
    `3lambda`
    C
    `lambda/9`
    D
    `9lambda`

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    The energy of electron in 1st orbit of hydrogen atom is -13.6 eV . What will be the energy of doubly ionised ._(3)Li^(7) atom in the first orbit?

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