Height of ionosphere is … km from ground...

Height of ionosphere is … km from ground surface.

12 km

80 km

400 km

50 km

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NIKITA PUBLICATION-COMMUNICATION SYSTEMS-Multiple Choice Questions (Space communication )

The air of earth's atmosphere responsible for absorbing a large port...
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Height of ionosphere is … km from ground surface.
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One way communication is called
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The region that contains free electrons, negative ions and positive io...
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Electromagnetic waves of frequency ……. are reflected from ionosphere.
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Because of tilting, which waves finally disappear?
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Temperature of troposphere decreases ….. ^(@)C//k.m.
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When an electromagnetic wave entres an ionised layer of enrth's aatmos...
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In which of the region of earth's atmosphere temperature decreases wit...
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In earth's atmosphere for F(1)-layer , the virutal height and critic...
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In earth's atmosphere , for F(2) - layer, the virtual height and crit...
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As the height of satellite orbit gets lower, the speed of the satel...
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An electron oscillating with a frequency of 3xx10^6 Hz, would generate...
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If three wave no atmosphere, the average temperature on the surface of...
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When an electromagnetic waves enter the ionised layer of ionosphare, ...
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Ultraviolet spectrum can be studied by using a
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When electromagnetic waves enter the ionised layer of ionosphere, then...
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The absorption of radiowaves by the atmosphere depends upon
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The ozone layer in the atmosphere absorbs
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Out of the following the radiation with lowest frequency is
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