Heisenberg's uncertainly principle is applicable to
Atoms only
Electrons only
Nucleus only
Any moving particle
The fundamental particle which is responsible for keeping the nucleons together is
Electron
Proton
Positron
Meson
The product of Δx and Δv is highest for
Neutron
α - particle
The first line in the atomic spectrum of hydrogen in the Balmer series appears at
7RH/144 cm-1
3RH/4 cm-1
5RH/36 cm-1
9RH/400 cm-1
In hydrogen atom if energy of an electron in ground state is 13.6 ev, then that in the first excited state is
6.8 ev
1.51 ev
3.4 ev
13.6 ev
The electrons of potassium were not ejected when red light fall on a piece of potassium metal. The electrons will be ejected when
Intensity of light is increased
Wave length of light is increased
Wave number of light is increased
Amplitude of light is increased
The number of nodal planes in 2pz orbital is
Zero
One
Two
Infinity
An electron has spin quantum number +1/2 and a magnetic quantum number -1. It cannot be present in
p - orbital
s - orbital
d - orbital
f - orbital
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 observation that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration is associated with
Heisenberg's uncertainty principle
Pauli's exclusion principle
Aufbau principle
Hund's rule of maximum multiplicity
