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When an electromagnetic wave entres an i...

When an electromagnetic wave entres an ionised layer of enrth's aatmosphere present in ionospher

A

the electron cloud will not oscilate in the electric field of the wave

B

the electron could will oscillate in the electric field of wave in the phase of sinusoidal electromagnetic wave

C

the electron clould will oscillate in the electric field of wave in the opposite phase of sinusoidal electromagnetic wave

D

the electron cloud will oscillate in the electric fileld of wave with a phase retardation of `90^(@)` for a sinusoidal electromagnetic wave.

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The correct Answer is:
D
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NIKITA PUBLICATION-COMMUNICATION SYSTEMS-Multiple Choice Questions (Space communication )
  1. Because of tilting, which waves finally disappear?

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  2. Temperature of troposphere decreases ….. ^(@)C//k.m.

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  3. When an electromagnetic wave entres an ionised layer of enrth's aatmos...

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  4. In which of the region of earth's atmosphere temperature decreases wit...

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

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

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

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

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

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

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  11. Ultraviolet spectrum can be studied by using a

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

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  13. The absorption of radiowaves by the atmosphere depends upon

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  14. The ozone layer in the atmosphere absorbs

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

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

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

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  18. Troposphere reflect the waves having frequency from ……

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

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  20. The EM waves when travel into different medium gets

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