The electron was shown experimentally to have wave properties by
de-Broglie
N Bohr
Davisson and Germer
Schrodinger
In a given atom no two electrons can have the same values of all the four quantum numbers. This is called
Hund's rule
Aufbau principle
Uncertainty principle
Pauli's exclusion principle
If an electron has spin quantum number + and magnetic quantum number -1, it cannot be present in
d-orbital
f-orbital
p-orbital
s-orbital
In the photoelectron emission, the energy of the emitted electron is
greater than the incident photon
same as that of the incident photon
smaller than the incident photon
proportional to the intensity of incident photon
The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is
0.17 Å
0.53 Å
0.265 Å
1.06 Å
The orbitals are called degenerate when
they have the same wave functions
they have the same wave functions but different energies
they have different wave functions but same energy
they have the same energy
If uncertainty in position and momentum are equal, then uncertainty in velocity is
Which of the following is not permissible arrangement of electrons in an atom ?
n = 4, l = 0, m = 0, s = -1/2
n = 5, l = 3, m = 0, s = + 1/2
n = 3, l = 2, m = -3, s = -1/2
n = 3, l = 2, m = -2, s = -1/2
If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by
rn2
rn
r2 n2
The uncertainty in momentum of an electron is 1×10-5 kg-m/s. The minimum uncertainty in the measurement of the momentum of the helium atom is
1.05×10-28 m
1.05×10-26 m
5.27×10-30 m
5.25×10-28 m