The velocity of an electron in the third orbit of hydrogen atom is
7.27 × 107 cms-1
7.27 × 10-7 cms-1
3.64 × 107cms-1
None of these
What is the number of electrons in an atom which have n = 4, l = 2, m = -1 ?
10
5
2
1
What is the de Broglie wave length of a particle of mass 0.5g and velocity 50m/s ?
6.626 × 10-31m
2.65 × 10-32 m
2.65 × 10-31 m
none of these
No two electrons in an atom can have the same set of four quantum number. This is the statement of
Pauli's exclusion principle
Hund's rule
Aufbau principle
126 C and 146 C differ from each other in the number of
Nucleons
Mesons
Electrons
Protons
What will be the total spin resulting from a d6 configuration ?
3
3/2
Which orbital have zero electron density in xy plane ?
pz
dz2
dxy
dx2 - y2
The ratio of the time periods of revolutions of the electron in the third orbit of hydrogen and second orbit of He+ is
32:1
2:27
16:1
27:2
Who proposed the uncertainty principle ?
De Broglie
Davisson
Max Planck
Heisenberg
What is the frequency ratio between two radiations of wave length 400nm and 700nm in the visible spectrum ?
14/8
4/7
8/14
15/8
