Q. 5

The electrical conductively of pure germanium can be increased by
A. increasing the temperature

B. doping acceptor impurities

C. doping donor impurities

D. irradiating ultraviolet light on it.

Answer :

For A


Increasing the temperature increases the breaking of the covalent bonds and generation of more electron-hole pairs. Thus, increasing the conductivity.


For B and C


Since doping will increase the no. of charge carriers, therefore the conductivity will increase.


For D


Irradiating UV light on germanium will provide energy enough to break the covalent bond and thus create an electron-hole pair. Thus increasing the electrical conductivity.

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