Английский язык - это ключ к вашему успеху в настоящем и будущем. Английский выучить несложно. Важно уделить ему максимальное внимание.
I. Перепишите и письменно переведите предложения. Определите видовременную форму и залог сказуемого.
1. When the work had been completed the results were published in the magazine.
2. When the experiment was being made everybody was watching it with great interest.
3. A great deal of research work was done at this institute.
II. Перепишите и письменно переведите предложения, обращая внимание на разные значения слов it, that, one.
1. It was noisy in the hall as the students were talking about their summer holidays.
2. Last year the number of tourists to the Caucasus exceeded that of the previous one.
3. One must know traffic rules if one wants a drive a car safely.
III. Перепишите и письменно переведите предложения, обращая внимание на разные значения глаголов to be, to have, to do.
1. I have to translate the text but I have no dictionary.
2. The students usually do nothing on the day after the exam.
3. The weather was fine when we had our holidays.
4. He was only 12 when his family moved to Moscow.
5. Professor N was to deliver a lecture on history at the club.
IV. Перепишите и письменно переведите предложения, обращая внимание на функцию причастия, герундия, инфинитива.
1. Before writing our test we learn the necessary grammar rules.
2. Speaking about his new invention the young engineer told us many interesting
3. Alexei Leonov was the first man to step into space.
4. To build new electric stations is to develop our industry.
V. Прочтите и устно переведите текст. Перепишите и письменно переведите 1, 2, 3 и 4-й абзацы.
ENERGY AND ELECTRONS
1. The structure of atom is similar to planetary system, electrons orbiting around a certain nucleus. Electrons also rotate about their own axes. We know the rate of electron rotation and the orbital path determine the amount of energy passed by the atom.
2. The total energy contained in any atom is known to be the sum of the energies of the individual electrons. Electrons of a given atom can be changed from their position by different energies. Radioactive materials, for example, are constantly undergoing a change. Radioactive energy emitted from the material changes it from one form to another. It is also possible to change the atom structure by means of controlled nuclear reaction.
3. There is a simple method of changing the amount of energy in a given atomic structure. A photoelectric cell has a large area photocathode made from chemically active materials. These materials are alkali metals.
4. There are two basic laws of photo electricity. The first law states that the number of electrons released per unit of time from photoelectric surface is directly proportional to the intensity of the incident light (падающий свет).
5. The second law states that the maximum energy of electrons coming from photoelectric surface is independent of the intensity of the incident light and is directly proportional to the frequency of the light. The higher the frequency of incident of radiation, the higher is the energy of photoelectrons.