XI. Translate into Russian:

1. There are two terms in the academic year. 2. There will be a meeting at the institute.

3. Is there a hostel near your institute? 4. There was no physical paper in that journal.

5. There were many applicants for entry in our city in August.

Laboratory work I

Ex. I. Listen and repeat the following words and word-groups, translate them into Russian:

16. nobody saw it;

1. an electron; 17. how and when it moves;

2. to mean; 18. how fast it travels;

3. the yellow fossil resin; 19. for the benefit of;

4. to think; 20. its lightning-like flight;

5. to notice; 21. a carrier of a certain amount

6. amber; of electricity;

7. in Greek; 22. a very small figure;

8. the effect of attraction; 23. at the point of the wire;

9. but in our century; 24. to move through;

11. a very special meaning; 25. the radius and mass of an electron;

12. half (of) a century ago; 26. a round tiny ball;

13. more than half (of) century ago; 27. in comparison with;

14. identical to one another; 28. in diameter;

15. at the heart of; 29. under the same conditions.

Ex. III. Answer the following questions:

1. Who noticed the effect of attraction of small light objects for the first time?

2. What does science know about the electron? 3. What does the word «electron» mean?

4. What is there at the heart of all the electron tubes? 5. An electron is a positively charged particle, isn't it?

Ex. IV. Repeat the following sentences after the speaker and translate them into Russian:

1. There is a flow of about 6 multiplied by 10 to the 18th power electrons per second in one ampere. 2. It is interesting to know more about the behaviour of all the electrons.

2. If we rub a piece of amber it will attract small light objects.

3. Scientists discovered electron more than half of a century ago.

Ex. V. Say the plural forms of the following nouns:

radius, size, nucleus, century, mass, datum, analysis, formula.

Ex. VI. Give Russian equivalents to the following sentences:

1. Scientists think that an electron is a round tiny ball.

2. The electron is as small in comparison with a ping-pong ball as the ball in comparison with the orbit of the Earth.

3. Under the same conditions all the electrons are identical to one another.

4. There are many electron tubes and the electron is at the heart of all of them.

Ex. VII. Make the following sentences negative and interrogative as in:

Model I. There is a new device in our laboratory.

There is no new device in our laboratory.

Is there a new device in our laboratory?

Now do it yourself:

1. There is a piece of amber on the table.

Model II. They know everything about electricity.

They do not know everything about electricity.

Do they know everything about electricity?

Now do it yourself:

2. They discuss the behaviour of electrons.

Model III. He speaks about the radius and mass of electrons.

He does not speak about the radius and mass of electrons.

Does he speak about the radius and mass of electrons?

Now do it yourself:

3. He studies the motion of electrons.

Model IV. They noticed the effect of attraction.

They did not notice the effect of attraction.

Did they notice the effect of attraction?

Now do it yourself:

4. They studied this property for the first time.

Model V. They will help us to make this experiment.

They will not help us to make this experiment.

Will they help us to make this experiment?

Now do it yourself:

5. He will know about the operation of this device.

Ex. VIII. Say the following sentences in the Past and the Future Indefinite Tense (Active Voice) as in:

Model I. We rub a piece of amber.

We rubbed a piece of amber. We shall rub a piece of amber. Now do it yourself:

1. We discover the new properties of the electron.

2. Science knows the weight and the size of electrons.

Model II. Does this particle move fast?

Did this particle move fast?

Will this particle move fast?

Now do it yourself:

3.Do we discuss the behaviour of electrons?

Model Ш. We don't study the structure of this substance.

We didn't study the structure of this substance.

We shan't study the structure of this substance.

Now do it yourself:

4. He doesn't make his experiments in the laboratory

Ex. IX. Say if you agree or not to the following statements using correspondingly: you are right — верно; you are not quite right — неверно.

1. Generators are important vacuum tubes. 2. All the molecules are in constant motion.3.The structure of an atom resembles a miniature solar system.4.The hydrogen atom is the largest and the most complex one.

Ex. X. Translate into English:

1. Наука знает много об электроне. 2. Ученые открыли электрон более полувека тому назад.3.Никто не видит электрон. 4.Что вы знаете об электроне?