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The waves that are bent down by the iono...

The waves that are bent down by the ionosphere are

A

grund waves

B

surface waves

C

space waves

D

sky waves

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The correct Answer is:
D
The waves that are bent down by the ionosphere are called sky waves.
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An eletromagnetic wave of frequency 28 MHz passes through the lower atmosphere of earth and gets incident on the ionosphere.Shall the ionosphere reflects these waves?

The highest frequency of transmitted wave that is returned to the earth by the layer of ionosphere after having been sent at some angle to normal is called

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Statement-1: Sky wave signals are used for long distance radio communication. These signals are in general less stable than ground wave signals Statement-2 : The state of ionosphere varies from hour to hour, day to day and season to season

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The highest frequency of radiowaves which when sent at some angle towards the ionosphere , gets reflected from that and returns to the earth is called

Ionosphere occurs in

NCERT FINGERTIPS ENGLISH-COMMUNITCATION SYSTEMS-Assertion And Reason
  1. The waves that are bent down by the ionosphere are

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  2. Assertion: Telephony is an example of point-to-point communication mod...

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  3. Assertion: The loss of strength of a signal while propagating through ...

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  4. Assertion: Amplification is necessary to compensate for the attenualti...

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  5. Assertion: The process of retrieval of information from the carrier wa...

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  6. Assertion: Digital signals are continous variations of voltage of curr...

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  7. Assertion: Microwave communication is preferred over optical communica...

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  8. Assertion: The ionosphere layer acts as a reflector for all range of f...

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  9. Assertion: It is possible to transmit signals from one place on the ea...

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  10. Statement-1: Short wave band are used for transmission fo radiowaves t...

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  11. Assertion : The information contained in our original low frequency ba...

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  12. Assertion: Long distance communication between two points on the earth...

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  13. Assertion: The television signals are propagated through sky waves. R...

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  14. Assertion: Space waves are used for line -of -sight communication. R...

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  15. Assertion: When the height of a TV transmission tower is increased by ...

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  16. Assertion: AM detection is the process of recovering the modulating si...

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  17. Assertion: Telephony is an example of point-to-point communication mod...

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  18. Assertion: The loss of strength of a signal while propagating through ...

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  19. Assertion: Amplification is necessary to compensate for the attenualti...

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  20. Assertion: The process of retrieval of information from the carrier wa...

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  21. Assertion: Digital signals are continous variations of voltage of curr...

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