increases the potential difference across the depletion zone
increases the number of donors on the n side
decreases the electric field in the depletion zone.
Number of donors is more because electrons
from –ve terminal of the cell pushes (enters)
the n side and decreases the number of
uncompensated pentavalent ion due to which
potential barrier is reduced. The neutralised
pentavalent atom are again in position to
MCQ (Single Correct Answer)
Choose the only false statement from the following.
In conductors the valence and conduction bands overlap.
Substances with energy gap of the order of 10 eV are insulators.
The resistivity of a semiconductor increases with increase in temperature.
The conductivity of a semiconductor increases with increase in temperature.
Option (a) is correct as in conductor conduction
and valance band overlap and the conduction band
is partially filled
Option (b) is correct as insulators have energy gap
of 5 - 10 eV.
Option (c) is incorrect as resistivity decreases with
increase in temperature.
Option (d) is correct as with increase in temperature,
more and more electrons jump to conduction band,
hence conductivity increases.