Home
Class 11
PHYSICS
Electromagnetic waves of frequencies hig...

Electromagnetic waves of frequencies higher than `9sqrt(2)` MHz are found to be not reflected by the ionosphere on a particular day at a place. The maximum electron density in the ionosphere is :

A

`sqrt(2)xx10^(12)//m^(3)*`

B

`sqrt(5)xx10^(12)//m^(3)*`

C

`2xx10^(12)//m^(3)*`

D

`3xx10^(12)//m^(3)*`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • COMMUNICATION SYSTEMS

    TARGET PUBLICATION|Exercise Competitive Thinking|46 Videos

  • COMMUNICATION SYSTEMS

    TARGET PUBLICATION|Exercise Evaluation Test|15 Videos

  • COMMUNICATION SYSTEMS

    TARGET PUBLICATION|Exercise Evaluation Test|15 Videos

  • ELECTRONS AND PHOTONS

    TARGET PUBLICATION|Exercise Evaluation Test|19 Videos

Similar Questions

Explore conceptually related problems

Frequencies higher than 5 MHz are found not to be reflected by the ionosphere on a particular day at a place. The maximum electron density of the ionosphere is

For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere?

Assertion : Electromagnetic waves with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency .

The maximum frequency of transmitted radio waves above which the radio waves are no longer reflected back by ionosphere is (N = maximum electron density of ionosphere, g = acceleration due to gravity)

TARGET PUBLICATION-COMMUNICATION SYSTEMS-Critical Thinking
  1. If a number of sine waves with modulation indices n(1),n(2),n(3)… modu...

    Text Solution

    |

  2. Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50V is a...

    Text Solution

    |

  3. In space communcation , the information can be passed from on place ...

    Text Solution

    |

  4. The maximum usable frequency in F-layer with original frequency in 50 ...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  7. The sky wave propagation is suitable for radio waves of frequency

    Text Solution

    |

  8. mesosphere reflects which of them following type of wave, particularly...

    Text Solution

    |

  9. A geo-synchronous satellite is:

    Text Solution

    |

  10. The height of a T.V. tower is 300 m. What is the maximum distance upto...

    Text Solution

    |

  11. Electromagnetic waves of frequencies higher than 9sqrt(2) MHz are foun...

    Text Solution

    |

  12. The maximum line-of -sight distance d(M) between two antennas having h...

    Text Solution

    |

  13. A transmitting antenna at the top of a tower has a height of 50 m and ...

    Text Solution

    |

  14. When an electromagnetic wave enters the ionised layer of ionosphere,...

    Text Solution

    |

  15. for the first pair of side band frequencies, band width required for a...

    Text Solution

    |

  16. In FM, frequency deviation is

    Text Solution

    |

  17. Consider an optical communication system operating at lambda=800 nm. S...

    Text Solution

    |

  18. A telephone link operating at a center frequency of 10 GHz is etablish...

    Text Solution

    |

  19. Assertion : FM broadcast is preferred over AM broadcast . Reason...

    Text Solution

    |

  20. Assertion : Higher the modulation index the reception will be strong a...

    Text Solution

    |