Home
Class 12
PHYSICS
Laser beams are used to measure long dis...

Laser beams are used to measure long distances because

A

They are monochromatic

B

They are highly polarised

C

They are coherent

D

They have high degree of parallelism 26

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • HEATING AND CHEMICAL EFFECT OF CURRENT

    ERRORLESS |Exercise Self Evaluation Test|14 Videos
  • MAGNETIC EFFECT OF CURRENT

    ERRORLESS |Exercise Exercise|394 Videos
ERRORLESS -KINETIC THEORY OF GASES-QUESTIONS
  1. The maximum distance upto which TV transmission from a TV tower of hei...

    Text Solution

    |

  2. A laser beam is used for carrying our surgery because it

    Text Solution

    |

  3. Laser beams are used to measure long distances because

    Text Solution

    |

  4. An oscillator is producing FM waves of requency 2kHz with a variation ...

    Text Solution

    |

  5. The maximum peak to peak voltage of an AM wire is 24 mV and the minimu...

    Text Solution

    |

  6. Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V ...

    Text Solution

    |

  7. What is the modulation index of an over modulated wave

    Text Solution

    |

  8. Basically, the product modulator is

    Text Solution

    |

  9. If f(0) and f(f) represent the carrier wave frequencies for amplitude ...

    Text Solution

    |

  10. Which of the following is the disadvantage of FM over AM

    Text Solution

    |

  11. If a number of sine waves with modulation indices n,n,n ........ mod...

    Text Solution

    |

  12. An AM wave has 1800 watt of total power content, For 100% modulation...

    Text Solution

    |

  13. The frequency of a FM transmitter without signal input is called

    Text Solution

    |

  14. What type of modulation is employed in india for radio transmission

    Text Solution

    |

  15. When the modulating frequency is doubled, the modulation index is halv...

    Text Solution

    |

  16. An antenna is a device

    Text Solution

    |

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

    Text Solution

    |

  18. Indicate which one of the following system is digital

    Text Solution

    |

  19. In a communication system, noise is most likely to affect the signal

    Text Solution

    |

  20. The waves used in telecommunication are

    Text Solution

    |