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To an observer on the earth the stars ap...

To an observer on the earth the stars appear to twinkle. This can be ascribed to

A

the stars do not emit the light continuously

B

the absorpation of some frequencies in the light emitted by the star in the earth's atmosphere

C

there is a Doppler effect

D

of the fluctuations in the refractive index in the earth's atmosphere

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Verified by Experts

The correct Answer is:
D
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NIKITA PUBLICATION-COMMUNICATION SYSTEMS-Multiple Choice Questions (Space communication )
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  2. An antenna is a device

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  3. The frequency of signals up to 1.5 MHz can be propagated using

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

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  5. The Ionosphere reflects the

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  6. Which of the following is not a transmission media used in communicat...

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  7. In which frequency range, space waves are normally propagated?

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  8. While tuning in a certain broad cast station with a receiver, we are a...

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  9. If the frequency of E.M radiations is halved then the energy of EM ra...

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  10. The frequency of a wave propagating in D-region having refractive inde...

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  11. The ground wave communication cannot be occur above a distance of

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  12. Modern is a device which performs

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  13. For the propagation of ground the aerials must be

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  14. Audio signals cannot be directly transmitted into to space because

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  15. Microwaves are the electromagnetic waves with frequency, in the range ...

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  16. In short wave communication waves of which of the following frequencie...

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  17. To an observer on the earth the stars appear to twinkle. This can be a...

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  18. The maximum distance upto which TV transmission from a TV tower of...

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  19. A geosynchronous satellite is

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  20. Antennas are used to receive and transmit

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