Power Engineering. Соколова Е.В. - 29 стр.

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10 Lesson 10
10.1 Прочтите слова согласно транскрипции
envelope evacuate , collide , collision , ionization cumulative , argon ,neon ,
helium , mercury, therefore, vapour .
10.2 Прочтите слова, обращая внимание на смещение ударения
evacuate — evacuation; molecule — molecular; liberate —liberation; process-
process;
impact-impact; necessary — necessity.
10.3 Сгруппируйте эквиваленты
therefore, destructive, liberate, envelope, evacuate, collide, likewise, to take
place
колба, разрежать(воздух), сталкиваться, освобождать, иметь место, по-
добным образом, следовательно, разрушительный
10.4 Сгруппируйте синонимы
remain, to take place, definite, steady, emit, nearly, liberate, stay, occur, cer-
tain, constant, give off, almost, free.
10.5 Прочтите и переведите текст
Effect of gas
1. If the envelope of the tubes is not completely evacuated, so that a small
amount of gas remains enclosed, some electrons in travelling toward the plate may
collide with molecules of the gas. Such collisions may result in releasing electrons
from their orbits within the gas atoms, and once free these electrons likewise are at-
tracted to the plate. They may in turn collide with other gas molecules, and liberate
more electrons. This process is known as ionization, and it may be cumulative in na-
ture if enough gas is present so that a large number of collisions take place in the
space between cathode and plate.
2. A definite amount of energy is required to dislodge an electron from an atom
of any particular gas, and the voltage
necessary to furnish this amount of energy is called the ionization potential for
the gas. Typical values are listed below.
Gas Ionization potential
Argon .... 15.7
Neon..... 21,47
Helium.... 4.0
31
        10 Lesson 10

        10.1 Прочтите слова согласно транскрипции

      envelope evacuate , collide , collision , ionization cumulative , argon ,neon ,
helium , mercury, therefore, vapour .

        10.2 Прочтите слова, обращая внимание на смещение ударения

      evacuate — evacuation; molecule — molecular; liberate —liberation; process-
process; impact-impact; necessary — necessity.

        10.3 Сгруппируйте эквиваленты

        therefore, destructive, liberate, envelope, evacuate, collide, likewise, to take
place

     колба, разрежать(воздух), сталкиваться, освобождать, иметь место, по-
добным образом, следовательно, разрушительный

        10.4 Сгруппируйте синонимы

       remain, to take place, definite, steady, emit, nearly, liberate, stay, occur, cer-
tain, constant, give off, almost, free.

        10.5 Прочтите и переведите текст

        Effect of gas
       1. If the envelope of the tubes is not completely evacuated, so that a small
amount of gas remains enclosed, some electrons in travelling toward the plate may
collide with molecules of the gas. Such collisions may result in releasing electrons
from their orbits within the gas atoms, and once free these electrons likewise are at-
tracted to the plate. They may in turn collide with other gas molecules, and liberate
more electrons. This process is known as ionization, and it may be cumulative in na-
ture if enough gas is present so that a large number of collisions take place in the
space between cathode and plate.
       2. A definite amount of energy is required to dislodge an electron from an atom
of any particular gas, and the voltage
       necessary to furnish this amount of energy is called the ionization potential for
the gas. Typical values are listed below.
       Gas Ionization potential
       Argon .... 15.7
       Neon..... 21,47
       Helium.... 4.0
                                                                                       31

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