What is the kinetic energy of the electron in an orbit of radius r in the hydrogen atom?
(e = electronic charge)
1.
2.
3.
4.
The ionisation potential of hydrogen atom is
1. 13.60 volt
2. 8.24 volt
3. 10.36 volt
4. 14.24 bolt
Orbital acceleration of electrons is:
1. \(\frac{n^2h^2}{4\pi^2m^2r^3}\)
2. \(\frac{n^2h^2}{4n^2r^3}\)
3. \(\frac{4n^2h^2}{\pi^2m^2r^3}\)
4. \(\frac{4n^2h^2}{4\pi^2m^2r^3}\)
Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model:
1. 13.6 eV
2. 0.65 eV
3. 1.9 eV
4. 11.1 eV
The energy of an electron in an excited hydrogen atom is -3.4 eV.
Its angular momentum will be:
(h = 6.626 10-34 J-s)
1. 1.11 1034 J s
2. 1.51 10-31 J s
3. 2.11 10-34 J s
4. 3.72 10-34 J s
As per the Bohr model, the minimum energy (in eV) required to remove the electron from the ground state of a double ionised lithium ion (Z = 3) is:
1. 1.51
2. 13.6
3. 40.8
4. 122.4
According to Bohr's theory, the moment of momentum of an electron revolving in second orbit of hydrogen atom will be:
1. \(2\pi h\)
2. \(\pi h\)
3. \(\frac{h}{\pi}\)
4. \(\frac{2h}{\pi}\)
The ionisation energy of a hydrogen atom is 13.6 eV. Following Bohr's theory, what is the energy corresponding to a transition between the 3rd and 4th orbit?
1. 3.40 eV
2. 1.51 eV
3. 0.85 eV
4. 0.66 eV
The ratio of the energies of the hydrogen atom in its first to second excited states is
1.
2.
3.
4. 4
The energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. What is the energy (in eV) required to remove both the electrons from a neutral helium atom?
1. 38.2
2. 49.2
3. 51.8
4. 79.0