Telecommunications

What would the world be like without its telecommunications network? Telecommunications means communicating over long distances. In this section of your physics course you`ll have studied different forms of communicating over long distances such as morse code, telephone,radio, satellite and optical fibres. At this exact moment you are using the internet which is opening up new ways to communicate over long distances. Now try these practice questions on the wonderful topic of telecommunications. To find the answers or hints to the questions remember and click this symbol which you`ll find at the end of each question.

1. Joseph saw a demolition explosion in a distant block of flats. He saw the flash first and then 3 seconds later he heard the explosion.
   a) Explain why he saw the flash of light first.
   b) Calculate the distance Joseph was from the explosion?
   

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2. What is the name of the part of the phone that sends out your voice signal?
   

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3. A telecommunications engineer was examining a signal sent down the telephone line with an oscilloscope. Draw the picture of the new signal if the frequency of the signal was doubled.
   
   
   
   
   
   

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4. 
   The following diagram shows waves beside a harbour wall.
   
   Calculate the wavelength of the wave and the frequency of the wave if the waves have speed 8m/s.
   
   
   
   
   
   
   

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5. Mark and Shaheen are doing a project on the workings of a radio. They have built the following block diagram of a radio. Copy the blocks and fill in the missing names.
   
   
   

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6. Radio 5 Live can be found on the MW band at 909kHz.
   a) Calculate the wavelength of Radio 5 Live.

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7. Show by a diagram how it is possible to receive shortwave transmissions better than long wave transmissions in hilly areas of the country.

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8. Linda`s car radio is not working properly after her aerial was broken in the carwash.
   Why does a car need an aerial on the outside?

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9. What is meant by a geostationary satellite?

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10. Nowdays tv signals can be sent down an optical fibre .
    a) Describe an optical fibre?
    b) Copy and complete the diagram shown below of how light passes down such a fibre.

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