Sodium has body centred packing. Distance between two nearest atoms is 3.7Å. The lattice parameter is
6.8Å
4.3Å
3.0Å
8.6Å
The correct relationship between the two current gains and in a transistor is
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
zero
Which of the following when added as an impurity into silicon produces n-type semiconductor?
P
Al
B
Mg
In a junction diode, the holes are due to
protons
extra electrons
neutrons
missing electrons
Diamond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
To obtain a p-type germanium semiconductor, it must be doped with
phosphorus
indium
antimony
arsenic
Phosphorus
Aluminium
Magnesium
Both (b) and (c)
The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
