Прочитайте текст и определите какой из заголовков соответствует тексту Of the many types of tubes wh...: ответ на тест 606798 - Английский язык

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Of the many types of tubes which are in use, the simplest is the diode.
This is a two-element tube which consists of an emitter of electrons (the cathode) and a collector of electrons (the plate or the anode).
The term diode refers to the number of electrodes within the tube. The main function of the two-element tube is as converter of power. By this we understand that by means of the diode the electric power can be converted. Alternating voltage is converted in the form of pulsating direct current (the convertion of a. c. power into d. с power). This is the process of rectification.

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Of the many types of tubes which are in use, the simplest is the diode.
This is a two-element tube which consists of an emitter of electrons (the cathode) and a collector of electrons (the plate or the anode).
The term diode refers to the number of electrodes within the tube. The main function of the two-element tube is as converter of power. By this we understand that by means of the diode the electric power can be converted. Alternating voltage is converted in the form of pulsating direct current (the convertion of a. c. power into d. с power). This is the process of rectification.

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The triode, or three electrode tube, is an elaboration of the diode.
The diode consists of two electrodes. They also appear in the triode and they constitute the basis of the triode. In the triode the third electrode (the control grid) is added in the space between the emmitter and the plate.
The control grid is a metal structure which may be of different shape, depending upon the design of the tube.
The basic function of the triode is to amplify the current, or voltage or electric power. In this process of amplification the control grid plays a most important role.

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A metal rectifier, a widely used form of rectifier, is the metallic type consisting essentially of a number of units formed by depositing a layer of semiconducting material, such as copperoxide on a metal conducting base. These units, generally in the form of washers, are assembled on rods under pressure, the number of units employed being determined by the voltage. Each unit has the peculiar property of passing current freely when the semi-conducting layer is positive and allowing practically no current to flow in the opposite direction. This form of rectifier has the great advantage of strength, absence of moving parts and relative simplicity.

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Another type of rectifier is represented by various kinds of two-electrode valves, or diodes. These consist of a glass tube or bulb containing an electron-emmiting member (the cathode) and an electrode (called the anode) which collects the emitted electrons and causes a flow of current so long as it is positive with respect to the cathode. The cathode heater is supplied with a suitable voltage from the transformer secondary to provide the heating necessary for the emission of electrons.

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Radio waves, light, X-rays, and some cosmic rays - they all belong to the same family. They travel at the velocity of light.
The wave has both electric and magnetic components which are bound together. At the end of its travel the wave gives up energy. The ether waves are those we know as wireless waves.
When the waves are too long they are "seen" as infra-red, when they are too short they are "seen" as ultra-violet. Shorter than thе ultra-violet are X-rays and far shorter than the shortest of these are the "gamma" rays, and finally the cosmic rays.