Bohr concept of orbit in an atom contradicts
Pauli's exclusion Principle
Hund's rule
(n + l) rule
Uncertainty principle
The orbital angular momentum of an electron in 3s orbital is
Zero
h/2π
√2 h/2π
None of these
The orbital with zero electron density in the xy plane is
pz
dz2
dxy
dx2 - y2
A 40 watt bulb emits radiation of wave length 5500 Ao. The number of photons emitted per second by the bulb is
3.6 × 10-19
1.11 × 1020
1.11 × 10-20
3.6 × 1019
The number of electrons in N3 - is
7
10
3
17
The Planck's constant has a unit of
Energy
Work
Angular momentum
Linear momentum
The frequency ratio between two radiations of wave length 400nm and 700nm in the visible spectrum is
14/8
4/7
8/14
15/8
The first energy shell that can have f - orbitals is
Second
First
Fourth
Third
The wave length of a radio wave having frequency 2.5 × 105 Hz is
1.2 × 103m
1.2 × 10-3m
8.33 × 102m
The ratio of the radii of the 2nd and 3rd Bohr orbits in hydrogen atom is
3:8
3:4
9:16
4:9
