83. Thremionic emission is surface phenomena.
84. When a hydrogen atom goes from the ground
state to the first excited state in which kinetic energy
decreases and potential energy increases.
85. The property of random arrangement of atoms
are common to liquids and amorphous solids.
86. The possible number of Branais lattices in space
is 14.
87. The molecular crystals are solid at low
temperature because of the Vander Walls force
arising out of polarisation.
88. In a semi conductor, the forbidden energy gap
is of the order of 1 eV.
89. Electrons moving like the molecules of a gas
exist in metallic solids.
90. The free electron model of metallic solid does
not explain the range of resistivities.
91. In forbidden band an electron cannot lie in a
crystal.
92. Doping materials are called impurities because
they can alter the crystal structure.
93. The majority carriers in a semiconductor is holes
in p-type and electrons in n-type.
94. The principal effect of the negative space
change in a vacuum tube is to decrease the plate
current.
95. On making grid voltage excessively negative
the plate resistance R
becomes infinite.
p
96. The output of a rectifier circuit is pulsating
voltage which is a mixture of an a.c. component
and a d.c. component. The circuit used to eliminate
a.c from d.c voltage is called filter.
97. The static amplification factor of a triode valve
depends upon relative positions of cathode, grid
and plate.
98. Cathodes are coated with Barium oxide to lower
the work function.
99. The grid and plate voltage in a triode are in
opposite phase.
100. The drift velocity of electrons is expected to be greater than holes
Please do comment also refer any new chapter which you want to see
to be greater than holes.
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