WorksheetsUnit 1 - Electrical properties of materials - Quiz 1
Total questions: 15
Worksheet time: 8mins
In solids, _________in outer most orbits of atoms determine its electrical properties
protons
neutron
electrons
positron
Free electron theory has been developed in ----------- main stages
1
2
3
5
This theory was developed by Drude & Lorentz in 1900
Classical free electron theory
Quantum free electron theory
Zone theory
Bloch theory
Sommerfield developed the quantum free electron theory in
1956
1900
1927
1928
According to this theory, free electrons move in a periodic potential provided by the lattice
Classical free electron theory
Quantum free electron theory
free electron theory
zone theory
In CFET, free electrons move in
unidirection
bidirection
random direction
one path
There is no loss of energy and resultant velocity is zero, this indicates ______ of free electrons
inelastic collision
elastic collision
Direct compact
Oblique impact
In QFET, Energy levels are
discrete
continuous
discontinuous
has increasing value
QFET follows
Maxwell-Boltzmann distribution
Bose-Einstein distribution
Fermi-Dirac distribution
Einstein-Kalam distribution
Electron occupying an energy level can be determined by
probability function F(E)
probability function Z(E)
Normalized function F(E)
Occupation function N(E)
Highest energy level that can be occupied by an electron at 0 K
Excited state
Conduction state
Fermi energy
Average energy
If F(E) =1, then
0% probability that the electrons to occupy energy level below Fermi level
50% probability that the electrons to occupy energy level below Fermi level
75% probability that the electrons to occupy energy level below Fermi level
100% probability that the electrons to occupy energy level below Fermi level
Carrier concentration in metals is
ZE x FE
Z(E) x F(E) dE
N(E)dE x F(E) dE
Z(E)dE
Electric field is defined as the ratio between
Voltage and Length
Current and Length
Current density and Length
Length and Area
The relaxation time of electron is equal to
10-10 Sec
10-16 Sec
10-12 Sec
10-14 Sec
