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The electromagnetic waves of frequency 8...

The electromagnetic waves of frequency `80 MHz` and `200 MHz`

A

can be reflected by troposphere

B

can be reflected by ionosphere

C

can be reflected by mesosphere

D

cannot be reflected by any layer of earth's atmosphere

Text Solution

Verified by Experts

The correct Answer is:
D
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NARAYNA-COMMUNICATION SYSTEM-C.U.Q
  1. High frequency waves are

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  2. As the e.m waves travel in free spaces

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  3. The electromagnetic waves of frequency 80 MHz and 200 MHz

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  4. The better propagation mode to propagate television frequency and rada...

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  5. Micro wave link repeaters are typically 50 km apart

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  6. Attenuation of ground waves is due to (1) Diffraction effect (2) R...

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  7. The ground wave eventually disappears, as one moves away from the tran...

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  8. The range of ground wave transmission can be increased by

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

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  10. Frequencies in the UHF range normally propagate by means of:

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  11. When a sky wave is reflected onto the ground

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  12. The electromagnetic waves of frequency 2 MHz and 30 MHz are

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  13. Among the follwing frequencies one will be suitable for beyond-the hor...

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  14. Among the follwing , the waves which can penetrate the ionosphere are

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  15. A: At great heights from surface of earth and close to earth ionisatio...

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  16. Through which mode of propagation, the radio waves can be sent from on...

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  17. The frequency at which communication will not be reliable is

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  18. The frequency above which radiation of electrical energy is practical ...

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  19. The ratio waves of frequency 300 MHz to 3000 MHz belong to

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  20. Coaxial cable is an example of

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