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When electromagnetic waves enter the ion...

When electromagnetic waves enter the ionised layer of ionosphere, then the relative permittivity i.e. dielectric constant of the ionised layer

A

does not change

B

appears to increase

C

appears to decreases

D

sometimes e appears to increase and sometimes to decreases

Text Solution

Verified by Experts

The correct Answer is:
C
When electromagnetic wave enter the ionised layer of ionosphere , then the relative premittivity of the ionised layer appears to decrease .
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-COMMUNICATION SYSTEM-Exercise 1
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  5. In space communcation , the information can be passed from on place ...

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  6. What fraction of the surface area of earth can be covered to estab...

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  8. For sky wave propagation of a 10 MHz signal, what should be the minimu...

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  10. Fading is the variation in the strength of a signal at a receiver due ...

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  11. In earth's atmosphere for E- layer , the virtual height and critical ...

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  12. If the TV telecast is to cover a radius of 120 km ( Given , the radiu...

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  13. Space wave propagation is used in (a) microwave communication (b) ...

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  15. The air of earth's atmosphere responsible for absorbing a large port...

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  16. Match the following column I and Column II

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  17. A radiowave that travels in a straight line from the transmitting ante...

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  18. In process of amplitude modulation of signal to be transmitted . S...

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  19. In amplitude modulation, carrier wave frequencies are:

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  20. In a detector, output circuit consists of R = 10kOmega and C = 100 p F...

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