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Put the verbs in brackets into the correct form. 1. What (occur) if holes and electrons (meet) in a semiconductor?

1. What (occur) if holes and electrons (meet) in a semiconductor?

2. We (get) an N-type semiconductor, if we (add) arsenic to silicon.

3. If gallium (introduce) into a silicon crystal, it (result) into a P-type semiconductor.

4. If the electron (have no) pair, it easily (free) itself.

5. A semiconductor (call) an N-type semiconductor, if the holes (be) the minority charge carriers.

6. If the thermal agitation (apply) to the silicon crystal, we (have) the holes, moving in the same way as the holes introduced by atoms of gallium.

3. Write a sentence with if/when … for each situation.

1. We can’t pretend to the best mark on our subject without the knowledge on P-type and N-type semiconductors.

If we have knowledge on P-type and N-type semiconductors we will pretend to the best mark on our subject.

2. I don’t make an impurity semiconductor, because I have no necessary equipment. If/when …, I….

3. I am not a member of the scientific group of the Semiconductor Development Department, so my name is not mentioned in the diploma. My name …, if/when I ….

4. I have always wanted to be a famous actor, and I’m not interested in conferences in physics.

If I …, my attention ….

5. My father works at the plant developing new types of semiconductor devices, and he is going to represent some of his equipment at a technical exhibition.

If my father …, he …

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