Radiophysics. Халюшева Г.Р. - 38 стр.

         rational – разумный, рациональный
         to be subjected to – подвергаться; быть подвергнутым
         impulse – импульс; толчок
         to be transmitted – передаваться
         circuit – цепь; контур
         random – беспорядочный
         load – нагрузка
         d.c. (direct current) – постоянный ток
         a.c. (alternating current) – переменный ток
         to drift – перемещаться (по течению)
         to swing back and forth – качаться, колебаться взад и вперёд
         voltage – напряжение

         9.3 Exercises



         9.3.1 Give Russian equivalents to the following words without using a dictionary


                                  Аtom                     Еlement                        Оperation
                               Americium                   Helium                           Orbit
                                 Curium                    Isotope                          Proton
                                Compact                     Mass                          Plutonium
                                Diameter                 Neptunium                         Uranium
                                Electron                   Neutron

         9.3.2         Read and translate the text

        9.3.3       Answer the following questions:


           1. What do we call an element? 2. What elements do you know? 3. What is atom? 4. What atoms, created
artificially, do you know? 5. How many particles have been found in the atom? 6. What do you know about the electron
(proton, neutron)? 7. What does the hydrogen atom look like? 8. What atoms are called isotopes? 9. What is the nature of
electricity? 10. How are these free electrons made available? 11. What is the speed of the electron flow?

         9.3.4         Use the verbs in brackets in the proper tense:


          1. Operation of electronic devices (to involve) methods of producing and controlling a flow of electrons. 2.
Therefore we first (to learn) what electrons are. 3. All matter (to be composed) of one or more elements. 4. Up to about 80
years ago we (to believe) the atom to be the final division of matter. 5. Some 12 particles (to be found) in the atom. 6. The
electron (to have) a negative charge. 7. Atoms and electrons (not can) be seen under microscopes. 8. If we imagine the
electron enlarged to 30 feet diameter, it (to be) 300 miles from its proton. 9. We may better understand helium, if we (to
consider) the isotope of the hydrogen atom. 10. The atomic weight of the hydrogen isotope (to be) double that of the
hydrogen atom. 11. The Bohr theory (to assume) the electrons to be negatively charged particles moving in definite orbits.
12. This theory (to be discarded) for one that pictures electrons as wavelike disturbances in space about a nucleus. 13.
Physicists (not to agree) on the exact structure of atoms. 14. Not so long ago textbooks (to tell) us that the precise nature of
electricity (not to be known).

            9.3.5      Give an outline of this text