How is data put on radio waves?

Radio waves

Task 1. Read and translate the text:

What are radio waves?

Radio waves are part of a larger group of waves classified all together as electromagnetic radiation. This large group of waves is broken down into smaller groups based upon their frequencies and wavelengths. Two examples of electromagnetic radiation (other than radio waves) are:

• Light -- which is the group of electromagnetic radiation you can see with your eyes
• X-rays -- which are a group from a higher frequency and they are what is used by doctors to see inside of you

How is data put on radio waves?

There are two common ways to put information in a radio wave. They are called A.M. and F.M. just like the two choices you've always known are on a radio. To understand these two ways of sending information it is important to know that radio waves, by themselves, have very regular patterns. Generally they keep the same amplitude or frequency all the time. (Amplitude is the "height" of the radio wave, frequency is how close the waves are to each other.)

A.M. stands for amplitude modulation. In this method, the information is put into a radio wave by varying the amplitude. For example, if all we wanted to do was send 1's and 0's, we could have just two different levels of amplitude that correspond to these numbers--1 being high, 0 being low.

F.M. stands for frequency modulation. This time the amplitude is kept constant, it is the frequency that is varied..

Task 2. Give the equivalents:

group of waves broken down based upon frequencies wavelengths to put information regular patterns stands for varying the amplitude kept constant

передати інформацію розкладається на означає частота регулярні ознаки амплітуда, що змінюється довжина хвилі група хвиль базується на тримається постійною

Task 3. Answer the questions:

1. Are the radio waves only electromagnetic radiation? 2. What waves we can see by our eyes? 3. What are the two common ways to put information in a radio wave? 4. What feature should be the same in each type? 5. How can the amplitude and frequency be shown on the figure? 6. What does AM stand for? 7. How is the information put into a radio wave in AM method? 8. What does FM stand for? 9. How is the information put into a radio wave in FM method?

Task 4. Find the mistake:

1. Radio waves are classified as electromagnetic radiation. 2. Radio is the electromagnetic radiation you can see with your eyes. 3. Light waves have a higher frequency and they are what is used by doctors. 4. Radio waves have any regular patterns 5. On the picture amplitude is the how close the waves are to each other, frequency is "height" of the radio wave. 6. A.M. stands for frequency modulation.7. In FM the amplitude isn’t kept constant. 8. The frequency that is varied in AM

Task 5. Complete the sentences:

1. Radio waves are part of ______________. 2.The group of electromagnetic radiation you can see with your eyes are ______________. 3. A group from a higher frequency waves are ____________. 4. The two common ways to put information in a radio wave are _____________. 5. Generally they keep ________________. 6. A.M. stands for ______________. 7. F.M. stands for _______________.

Task 6. Translate into English:

1. Радіо хвилі відносяться до електромагнітних хвиль. 2. Група електромагнітних хвиль розкладається на менші групи, що базуються на довжині хвиль або частоті. 3. Існує 2 шляхи передачі інформації радіо хвилями, це АМ та ФМ. 4. АМ хвилі означають модуляцію амплітуди. 5. ФМ хвилі означають модуляцію частоти. 6. При АМ хвилях частота залишається постійною, а амплітуда міняється. 7. При ФМ хвилях амплітуда залишається постійною, а частота міняється

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