Q4 of 71 Page 418

The impurity atoms with which pure silicon may be doped to make it a p-type semiconductor are those of

To make p-type semiconductor we dope Silicon with trivalent atoms, i.e., B.) Boron and D.) Aluminum, since trivalent atoms will create holes.

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In a p-n junction with open ends,

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In a p-n junction,

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The electrical conductively of pure germanium can be increased by

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A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be