6.2 Words and word–combinations to be remembered

Electric current – ток

receiver – приёмник

cork – пробка

to bob up and down – подпрыгивать

to broadcast – передавать (по радио, телевидению)

transmitter – (радио) передатчик

audio frequency – звуковая частота

voltage – напряжение

fluctuating – колеблющийся

series (of) – ряд, серия

origin – место возникновения

carrier frequency – несущая частота

to generate – порождать; вызывать; производить; генерировать

wire – провод

alternating current – переменный ток

to catch (caught; caught) – ловить, захватывать

to tune – настраивать

dial – шкала

to permit – позволять

picked up – зд. уловленные

valve – лампа

circuit – цепь; контур

device – устройство; прибор

hearing aids – слуховые аппараты

ground waves – земные волны

sky waves – волны, отражённые от верхних слоёв атмосферы

to own – обладать

relay – реле

6.3 Exercises

6.3.1 Give Russian equivalents to the following words without using a dictionary:

automatic factor

automation inert

active material

activity mechanical

chemical ordinary

civilization practical

combination press

communication progress

elastic transformation

electricity technological

6.3.2 Read and translate the text

6.3.3 Answer the following questions:

1. What is the difference between radio – and sound waves? 2. Now do we call the distance from the top of one wave to the top of the next? 3. What is the height of a wave? 4. What is the wave frequency? 5. What have you learnt about the microphone? 6. What is the carrier frequency? 7. What is the function of the antenna in a radio receiving set? 8. Why do you get poor reception on FM or TV sets it you live beyond 50 miles from the station? 9. What is the difference between ground waves and sky waves?

6.3.4 Insert the necessary prepositions:

1. Radio waves travel long distances ________ space. 2. A radio message may travel _______ the world. 3. There, sound waves are changed ______ varying electric currents. 4. If you drop a stone _____ water, circles of waves start to travel _____ all directions. 5. The distance ______ the top of one wave ____ the top of the next is the wave length. 6. Sound

waves range _______ 16 ____ 20,000 vibrations _____ second. 7. The voltage ____ this fluctuating current is now increased _______ means ____ an audio amplifier. 8. The carrier waves ______ radio take the place _____ the wires______ telephone. 9. Each broadcasting station sends _______ waves ______ a certain frequency. 10. Radio waves leaving the antenna _____ the sending point go ___ all directions.