Home
Class 12
PHYSICS
Electromagnetic waves of frequency ……. a...

Electromagnetic waves of frequency ……. are reflected from ionosphere.

A

100 MHz

B

2 MHz to 30 MHz

C

upto `1.5` MHz

D

less than `1.5` MHz

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • COMMUNICATION SYSTEMS

    NIKITA PUBLICATION|Exercise Multiple Choice Questions (Examples for Practice)|8 Videos

  • COMMUNICATION SYSTEMS

    NIKITA PUBLICATION|Exercise Multiple Choice Questions (Production and detection of amplitude modulated wave)|31 Videos

  • CIRCULAR MOTION

    NIKITA PUBLICATION|Exercise Multiple Choice Question|421 Videos

  • CURRENT ELECTRICITY

    NIKITA PUBLICATION|Exercise Multiple Choice Questions|314 Videos

Similar Questions

Explore conceptually related problems

Critical frequency that gets reflected back from ionosphere is

A plane electromagnetic wave of frequency w_(0) falls normally on the surface of a mirror approaching with a relativisitic velocity v. Then frequency of the reflected wave will be (given beta=(v)/(c ) ):

The electromagnetic wave of frequency 3 MHz to 30 MHz are

The electromagnetic wave of frequency 2 MHz to 30 MHz are

The electromagnetic waves of frequency 80 MHz and 200 MHz

An electromagnetic wave of frequency v=3.0 MHz passes from vacuum into a dielectric medium with permittivity epsilon=4.0 . Then

NIKITA PUBLICATION-COMMUNICATION SYSTEMS-Multiple Choice Questions (Space communication )
  1. One way communication is called

    Text Solution

    |

  2. The region that contains free electrons, negative ions and positive io...

    Text Solution

    |

  3. Electromagnetic waves of frequency ……. are reflected from ionosphere.

    Text Solution

    |

  4. Because of tilting, which waves finally disappear?

    Text Solution

    |

  5. Temperature of troposphere decreases ….. ^(@)C//k.m.

    Text Solution

    |

  6. When an electromagnetic wave entres an ionised layer of enrth's aatmos...

    Text Solution

    |

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

    Text Solution

    |

  8. In earth's atmosphere for F(1)-layer , the virutal height and critic...

    Text Solution

    |

  9. In earth's atmosphere , for F(2) - layer, the virtual height and crit...

    Text Solution

    |

  10. As the height of satellite orbit gets lower, the speed of the satel...

    Text Solution

    |

  11. An electron oscillating with a frequency of 3xx10^6 Hz, would generate...

    Text Solution

    |

  12. If three wave no atmosphere, the average temperature on the surface of...

    Text Solution

    |

  13. When an electromagnetic waves enter the ionised layer of ionosphare, ...

    Text Solution

    |

  14. Ultraviolet spectrum can be studied by using a

    Text Solution

    |

  15. When electromagnetic waves enter the ionised layer of ionosphere, then...

    Text Solution

    |

  16. The absorption of radiowaves by the atmosphere depends upon

    Text Solution

    |

  17. The ozone layer in the atmosphere absorbs

    Text Solution

    |

  18. Out of the following the radiation with lowest frequency is

    Text Solution

    |

  19. Height of troposphere from ground surface is …… km.

    Text Solution

    |

  20. A man can take pictures of those objects which are not fully visible t...

    Text Solution

    |