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THE USE OF ELECTROMAGNETIC WAVES




АMany experiments having been conducted to discovery of the best types of radiation, a lamp producing sterilizing radiation was developed. The lamp has been applied to surgery, the radiation having been shown to be harmless to human flesh. By bathing the operating table in the rays it is possible to ensure sterility, its principle being the exclusion of germs in the modern operating theater.
 
BAn interesting use is made of longer waves. Waves between 10 and 100 miles in length can be used to melt metals without flame. The metal is placed into a crucible (вакуум-ковш) which is inside the solenoid generating the waves. The latter being led into the metal, their absorption sets up secondary currents which result in heating the metal until it melts. The coil carrying the current remains quite cold. On the same principle it is possible to cook the dinner in a cold oven. A kettle may be boiled on ice. In the same way fish were cooked in water remaining perfectly cold.
 
CVery long electromagnetic waves are also employed to examine the structure of the earth. The waves having a length of about 25 miles are sent downwards. When encountering a metallic ore body, they are absorbed and electromagnetic field is set up. This can be measured on the surface of the earth and as a result of these measurements it is possible to indicate the direction and depth of the ore. This method is often used in geophysical prospecting (разведка).

1) В каком абзаце текста (A-C) рассказывается о:

1. устройстве, позволяющем нагреть металл без помощи огня?

2. поиске рудных тел?

3. использовании волн средней длины?

4. удалении микробов?

5. применении научных открытий в повседневной жизни?

Найдите в тексте слова сходные по значению с данными ниже.

1. to carry out –

2. to use, to employ –

3. fire –

4. to show, to point out –

5. body –

6. to produce, generate –

Сопоставьте глаголы и существительные с предлогом так, чтобы получить 5 выражений, употребляя каждое слово только раз.

Verb Preposition+Noun
1. to measure 2. to use 3. to apply 4. to melt 5. to place A__to surgery B__on the surface C__without flame D__into a crucible E__in geophysical prospecting

 


Вставьте пропущенное слово согласно информации, данной в тексте.

1. Sterilizing radiation is harmless to human _____.

2. The absorption of waves in a crucible ____ secondary currents.

3. ____ which carries the current remains quite cold.

4. Electromagnetic waves are also employed to examine _______ of the earth.

5. When the waves encounter a metallic ore body, they are absorbed and electromagnetic ____ is set up.

Найдите в тексте необходимую информацию и дайте ответы на вопросы, приведенные ниже.

1. How can surgeons get sterility during the operation?

2. How is metal heated without flame?

3. What can an ordinary person do using electromagnetic waves?

4. What is the length of waves used in geophysical prospecting?

5. How can a geophysicist know the depth of ore body?







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