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In earth's atmosphere , for F(2) - layer...

In earth's atmosphere , for `F_(2)` - layer, the virtual height and critical frequency in night time are

A

210 km and 5 MHz

B

250 km and 6 MHz

C

280 km and 7 MHz

D

350 km and 6 MHz

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The correct Answer is:
D
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NIKITA PUBLICATION-COMMUNICATION SYSTEMS-Multiple Choice Questions (Space communication )
  1. In which of the region of earth's atmosphere temperature decreases wit...

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  2. In earth's atmosphere for F(1)-layer , the virutal height and critic...

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  3. In earth's atmosphere , for F(2) - layer, the virtual height and crit...

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  4. As the height of satellite orbit gets lower, the speed of the satel...

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  5. An electron oscillating with a frequency of 3xx10^6 Hz, would generate...

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  6. If three wave no atmosphere, the average temperature on the surface of...

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  7. When an electromagnetic waves enter the ionised layer of ionosphare, ...

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  8. Ultraviolet spectrum can be studied by using a

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  9. When electromagnetic waves enter the ionised layer of ionosphere, then...

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  10. The absorption of radiowaves by the atmosphere depends upon

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  11. The ozone layer in the atmosphere absorbs

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  12. Out of the following the radiation with lowest frequency is

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  13. Height of troposphere from ground surface is …… km.

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  14. A man can take pictures of those objects which are not fully visible t...

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  15. Troposphere reflect the waves having frequency from ……

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  16. Clouds and water vepours are present in the layer of atmosphere calle...

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  17. The EM waves when travel into different medium gets

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  18. Ultraviolet radiations is absorbed by:

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  19. Speed of electromagnetic waves is given

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  20. In space communication, the sound waves can be sent from one place t...

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