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I. Read the text. Choose the most suitable heading from the list (a-g) for each part (1-5) of the text. There are two extra headings which you do not need to use.

A. The Description of an Evacuated Chamber.

B. Necessary Precautions.

  1. The Limitation of Energy.

  2. Classical Cyclotrons and Modern Society.

E. Isochronisity.

F. The Application of Classical Cyclotrons.

G. Movement of Particles in Classical Cyclotrons.

II. Read the text. For statements (6-15) choose “True” if the statement is true according to the text, “False” if the statement is false:

  1. The orbits of ions in a uniform magnetic field occur at the same time.

  2. The mass of a particle increases, when it approaches the speed of light.

  3. In classical cyclotrons a particle can’t be accelerated many times.

  4. An ion source is situated in the middle of an evacuated chamber.

  5. An electromagnet creates a uniform field perpendicular to the plane faces.

  6. The frequency of an oscillator differs from the frequency of rotation of the particles.

  7. The electric field caused by this accelerating voltage is situated in the dees.

  8. Inside the dees the trajectory of the particle is circular.

  9. If there is no focusing, a particle will be lost.

  10. The energy of a particle can be diminished by the relativistic increase in its mass.

III. Read the text. For questions (16-20) choose the correct answer (a, b, c or d).

16) The key to the operation of a cyclotron is …

a) its mass.

b) a semicircle that particles overcome.

c) monochronisity.

d) isochronisity.

17) An evacuated chamber has …

a) a pillbox inside.

b) the shape of a semicircle.

c) the shape of a cylinder.

d) many disadvantages in its work.

18) The frequency of an oscillator is …

a) the same with that of particles in the magnetic field.

b) much more than that of particles in the magnetic field.

c) much less than that of particles in the magnetic field.

d) unknown for the moment.

19) Without means of focusing …

a) a particle will gain significant energy.

b) a particle will lose significant energy.

c) a particle won’t move.

d) a particle will be lost.

20) The energy of a particle in a classical cyclotron …

a) is gained without effort.

b) can be decreased in the beginning of work.

c) reverses the polarity.

d) is limited by the increase in its mass.

IV. Match (21-30) with their definitions (a-l). There are two definitions that you do not need to use.

21.

chamber

A.

reach a destination, either real or abstract

22.

uniform

B.

the place where something begins

23.

voltage

C.

change to the contrary

24.

source

D.

the number of occurrences within a given time period

25.

ion

E.

a relation between two opposite attributes or tendencies

26.

frequency

F.

an atom or molecule or group that has lost or gained one or more electrons

27.

reversing

G.

direct or control; projects, businesses

28.

to operate

H.

showing a single form or character in all occurrences

29.

to gain

I.

the rate at which energy is drawn from a source that produces a flow of electricity in a circuit

30.

polarity

J.

a natural or artificial enclosed space

K.

a very small piece of something

L.

the scientific study of natural forces, such as energy, heat, light, etc

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