Power Engineering. Соколова Е.В. - 23 стр.

      8 Lesson 8

      8.1 Прочтите слова согласно транскрипции

       maser, entirely, potentiality , derive , nucleus , molecule , excessive , klystron ,
discrete, appropriate , molecular, equalize, quantize, interference, characterize , fea-
ture , hydrogen

      8.2 Прочтите слова, обращая внимание на смещение ударения

      radiate - radiation; recognize - recognition; operate - operation; amplify -
amplification; potential -potentiality; electron - electronics; subject –subjection

      8.3 Сгруппируйте синонимы

       different, operate, affect, certain, change, release, use, drop, sophisticated, sup-
ply, complicated , fall, set free, apply, various , work, vary, feed, some, influence

      8.4 Сгруппируйте антонимы

      complicated , light, high, charge, internal, increase, definite, indefinite , dis-
charge, low , external, simple, heavy , decrease

     8.5 Прочтите вопросы перед каждым абзацем текста и найдите отве-
ты в тексте

       1. What does the word "maser" mean? 2. What is the model of the atom? 3.
How can light and radio waves be greatly amplified? 4. Which microwave devices
interact with a microwave field? 5. What does the elementary maser amplifier in-
volve? 6. What frequencies do masers operate at? 7. In what region have optical ma-
sers been used recently? 8. What are masers capable to produce?

      Masers

       1. Maser, acronym for "Microwave Amplification by Stimulated Emission and
Radiation", has become a recognised name for a microwave device. Being quite dif-
ferent from vacuum tubes and transistors, the maser operates entirely on quantum
principles. The maser is reported to be the first of the quantum electric devices. It is
known to be based on a new type of amplification with different properties and
potentialities. Quantum electronics derives its name from the bundles of energy
which affect the energy level by the atom.
       2. The model of the atom is considered to be a nucleus with one or more orbit-
ing electrons. These move in certain paths but, when an atom gains energy by absorp-
tion, these paths change, the atom having more energy.

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