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Give reasons for the following. Long dis...

Give reasons for the following. Long distance radio broadcast uses short wave bands

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CHETANA PUBLICATION-ELECTROMAGNETIC WAVES AND COMMUNICATON SYSTEM-EXERCISE
  1. What is meant by noise?

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  2. What is meant by bandwidth?

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  3. Give reasons for the following. Long distance radio broadcast uses sho...

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  4. Give reason for the following, satellite are used for long distance TV...

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  5. How does the effective power radiated by an antenna vary with waveleng...

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  6. Why should broadcasting programs use different frequencies?

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  7. Define modulation

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  8. What is demodulation?

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  9. Explain why is modulation needed.

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  10. State the different types of modulation.

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

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  12. Why does amplitude modulation give noisy reception?

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

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

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

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

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  17. The direction of EM wave is given by

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

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

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

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