- •Unit 7 The Movement of Holes Language Work
- •Present Perfect Passive (measurements have been done)
- •Fill in the gaps in the descriptions of the figures using the words from the table above where possible and the following verbs: break, free, move, come, occur.
- •Open the brackets and complete the dialogues with just, already, yet.
- •Put in become, broken, begun or come.
- •You are asking students questions about things they have done. Make questions with ever using the words in brackets.
- •Complete b’s answers. Some sentences are positive and some negative. Use the following verbs: write, use, design, interest, experiment, read.
- •Read the situations and write sentences using the example.
- •Complete these sentences with the following verbs (in the form of Present Perfect Passive).
- •Rewrite these sentences into the passive voice.
- •Make sentences from the words in brackets using the Present Perfect Passive.
- •Form adjectives from the following nouns using the suffix – ous and translate them.
- •Read and translate word-combinations.
- •Start from the first component:
- •Start from the second component:
- •Match the following sentences with their translations.
- •Choose as many words from the table of ex.1 as you can and form sensible sentences.
- •Specialist Reading
- •Read the text “The Movement of Holes”. Mark the following sentences as true (t) or false (f).
- •The Movement of Holes
- •Read the text again and complete the sentences with the correct ending.
- •Work in pairs. Ask your partner some questions based on the text. Make sure you use the correct auxiliary verb.
- •Summarize the text “The Movement of Holes” in 100 words using the following plan:
- •Translate the text, which contains additional information about electron-
- •Measuring the Movement of Holes in Crystal Surfaces
- •Speaking
- •Describe the process of recombination to your group mate using active terms of the Unit and the Present Perfect.
- •Try to work as an interpreter. Translate the explanation of the way the
- •Divide into two groups. Group a translates text a “Education”, group b translates text b “Science and Innovation" with a dictionary in writing. Text a education
Start from the second component:
2 |
|
Arsenic |
nucleus |
Germanium |
|
Aluminium |
|
Copper |
|
Silicon |
|
Selenium |
|
-
1
Electron
flow
Energy
Air
Fluid
Radiation
Current
Match the following sentences with their translations.
1. Do holes really move? |
a. Это было вызвано нагреванием. |
2. Recombination has occurred and a hole has disappeared. |
b. Проблема перемещения дырок была полностью рассмотрена. |
3. If no voltage is applied to the crystal, the movement of both holes and electrons is quite random. |
c. При тех же условиях (увеличение температуры на один градус Цельсия) проводимость кремния увеличится на 7%. |
4. Was this caused by heating? |
d. Произошла рекомбинация, и дырка исчезла. |
5. The effect is as though a hole has moved from point A to point C. |
e. Можем ли мы сказать, что носителями зарядов являются и электроны, и дырки? |
6. If some voltage is applied, then the electrons will begin to move in one direction, and the holes will begin to move in the opposite direction. |
f. Если никакого напряжения не приложено к кристаллу то движение как дырок, так и электронов совершенно хаотическое. |
7. Under the same conditions (the increase of temperature by one degree Centigrade) the conductivity of silicon will increase by 7 per cent. |
g. Эффект такой, будто бы дырка переместилась из точки A в точку C. |
8. Can we say that both electrons and holes are charge carriers? |
h. Действительно ли дырки движутся? |
9. The problem of the movement of holes has been completely considered? |
i. Если приложить какое-то напряжение, тогда электроны начнут двигаться в одном направлении, а дырки начнут двигаться в противоположном направлении. |
Choose as many words from the table of ex.1 as you can and form sensible sentences.
For example: Both electrons and holes are charge carriers.
Specialist Reading
Read the text “The Movement of Holes”. Mark the following sentences as true (t) or false (f).
In figure 1 exercise 2 we see that one covalent bond has broken, one electron has freed itself, and a hole has disappeared at point A.
The movement of electrons and holes is random.
A great number of electrons have freed themselves.
The hole has changed its position.
Conduction may take place in a pure conductor.
If some voltage is applied, the electrons begin to move in one direction and the holes begin to move in the opposite direction.
The increase of temperature of the semiconductor doesn’t increase its conductivity.