Donor type impurity is found in

0.1% of the composition of wastewater is contributed by three different types of materials. Choose the set of substances from the following which depicts all the three types of impurities found in wastewater.

0.1% of the composition of wastewater is contributed by three different types of materials. Choose the set of substances from the following which depicts all the three types of impurities found in wastewater.

To obtain n-type semiconductor , the impurity introduced is

What type of impurity is required to prepare an n-type semiconductor ?

What type of impurity is required to prepare a p-type semiconductor ?