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Explain why is modulation needed....

Explain why is modulation needed.

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CHETANA PUBLICATION-ELECTROMAGNETIC WAVES AND COMMUNICATON SYSTEM-EXERCISE
  1. Define modulation

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  2. What is demodulation?

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  3. Explain why is modulation needed.

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  4. State the different types of modulation.

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  5. What type of modulation is required for television broadcast?

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  6. Why does amplitude modulation give noisy reception?

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  7. Why are high frequency carrier waves used for transmission of audio si...

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  8. The EM wave emitted by theSun and responsible for heating the Earth's ...

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  9. Choose the correct options. Earth's atmosphere is rechest in

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  10. How does the frequency of a beam of ultraviolet light change when it t...

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  11. The direction of EM wave is given by

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  12. The maximum distance upto which TV transmission from a TV tower of he...

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  13. The waves used by artificial satellites for communication purposes are

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  14. If a TV telecast isto cover a radius of 640 km, what should be the hei...

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  15. In a communication system, noise is most likely to affect the signal.

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  16. For television broadcasting , the frequency employed is normally

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  17. A device that converts one form of energy into another form is termed ...

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  18. The process of regaining the information from carrier wavesis called.....

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  19. The outermost layer of the earth's atmosphere is........

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  20. The antenna behaves as resonant circuit only when its length is..........

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