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The layer (or play) effective role in sp...

The layer (or play) effective role in space communication at night is (or are) :

A

D-layer

B

E-layer

C

`F_(1)`-layer

D

`F_(2)-`layer

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D-layer and `F_(1)` layer disappear at night.
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PRADEEP-COMMUNICATION SYSTEMS-Exercise
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  2. The temperature of earth's atmosphere increases with height in

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  4. In electromagnetic wave, if vecE,vecB and vecv are the electric field ...

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  5. For sky wave propagation of a 18 MHz signal, what should be the minimu...

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  6. In ground or surface wave propagation, the ions of power in a signal w...

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  7. What mode of communication is employed for transmission of Tv signals?

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  8. Why can moon be not used as a communication satellite?

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  9. Height h(400=m) from the ground at place A, from which the readiowaves...

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  10. Height h(400=m) from the ground at place A, from which the readiowaves...

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  11. Height h(400=m) from the ground at place A, from which the readiowaves...

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  12. Height h(400=m) from the ground at place A, from which the readiowaves...

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  13. Height h(400=m) from the ground at place A, from which the readiowaves...

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  14. is the set up used in the transimiision of information from one place ...

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  15. is the set up used in the transimiision of information from one place ...

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  16. Data Transmission is the set up used in the transmision of information...

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  17. If the maximum values of signal and carrier waves are 4 V and 5 V resp...

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  18. Ina detector, output circuit consists of R=10kOmega and C=100 pF, the ...

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  19. What is the maximum usuable frequency (in MHz) for E-layer of atomosph...

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  20. A T.V. Tower has a height 100m. In order to triple its coverage range,...

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