Which one has the same unit that of Planck's constant ?
Energy
Work
Angular momentum
Linear momentum
The wave length of the first line of Balmer series of hydrogen atom is 6561Ao. The wave length of the third line of the series is
2180 Ao
4339 Ao
13122 Ao
5865 Ao
What is the number of electrons in K19 which have n = 3 and l = 1 ?
6
8
2
1
What is the ratio of the radii of the 2nd and 3rd Bohr orbits in hydrogen atom ?
3:8
3:4
9:16
4:9
Isotones are nuclei having
Same atomic numbers
Same mass number
Same number of protons
Same number of neutrons
What is the Bohr radius associated with hydrogen atom ?
0.529 × 10-10 cm
5.29 × 10-10m
0.529 ×10-10m
0.0529 × 10-10m
Which one of the following does Bohr theory fails to explain ?
Stability of hydrogen
Line spectra of hydrogen atom
Line spectra of Li2+
Splitting of spectral lines in the presence of magnetic field
Which theory observed that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration ?
Heisenberg's uncertainty principle
Pauli's exclusion principle
Aufbau principle
Hund's rule of maximum multiplicity
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
What is the orbital angular momentum of an electron in 3s orbital?
Zero
h/2π
√2 h/2π
None of these
