Home
Class 11
PHYSICS
Statement-1 : Diode lasers are used as o...

Statement-1 : Diode lasers are used as optical sources in capital communication.
Statement-2 : diode lasers consume less energy.

A

Statetment-I is True, Statement-II is True , Statement-II is a correct explanation for Statement-I

B

Statement-I is True, Statement-II is True , Statement-II is NOT a correct explanation for Statement-I

C

Statement-I is True, Statement-II is False

D

Statement-I is False, Statement-II is True

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTORS

    ALLEN |Exercise Part-3(Exercise-4)|50 Videos

  • SEMICONDUCTORS

    ALLEN |Exercise Part-3(Exercise-2)|49 Videos

  • PHYSICAL WORLD, UNITS AND DIMENSIONS & ERRORS IN MEASUREMENT

    ALLEN |Exercise EXERCISE-IV|7 Videos

  • WAVES AND OSCILLATIONS

    ALLEN |Exercise Part-1(Exercise-05)[B]|42 Videos

Similar Questions

Explore conceptually related problems

Statement-1: Moon cannot be used as a satellite for communication. Statement-2: Moon doesn't move in the equatorial plane of the earth.

Statement-1 : Description of sound as pressure wave is preferred over displacement wave Statement-2 : Source sensors (ear or mike) detect pressure changes.

Statement- 1 : A cloudy night is hotter than a clear sky night. Statement- 2 : Clouds are bad absorbers of heat.

Statement- 1 : Absolute zero temperature is not the temperature of zero energy. Statement- 2 : Only the intenal kinetic energy of the molecules is represented by temperature.

Statement- 1 : Water is considered unsuitable for use in thermometers. Statement- 2 : Thermal Expansion of water is non uniform.

Statement-1: The size of a hydrogen increases as it rises in air. Statement-2: The material of the balloon can be easily stretched.

Statement- 1 : Coolant coils are fitted at the top of a refrigerator , for formation of convection current. Statement- 2 : Air becomes denser on cooling.

Statement-1 : Sound travels faster in moist air Statement-2 : The density of moist air is less then density of dry air.

Statement-1: The bridges are declared unsafe after a long use. Statement-2: Elastic strength of bridges losses with time.

Statement-1 : Pendulum clocks go slow in summer and fast in winter. Statement-2 : The length of the pendulum used in clock increases in summer.

ALLEN -SEMICONDUCTORS-Part-3(Exercise-3)
  1. Assertion: Microwave communication is preferred to optical communicati...

    Text Solution

    |

  2. Statement-1 : Diode lasers are used as optical sources in capital comm...

    Text Solution

    |

  3. Statement-I : Television signals are received through sky-wave propaga...

    Text Solution

    |

  4. Statement-1 : Electromagnetic waves with frequencies smaller than the ...

    Text Solution

    |

  5. Assertion : In optical fibre, the diameter of the core is kept small. ...

    Text Solution

    |

  6. Assertion: The electromagnetic waves of shorter wavelength can travel ...

    Text Solution

    |

  7. Assertion: The surface wave propagation is used for medium wave band a...

    Text Solution

    |

  8. Assertion: The television broadcasting becomes weaker with increasing ...

    Text Solution

    |

  9. Assertion: The Microwave propagation is better than the sky wave propa...

    Text Solution

    |

  10. Statement-I : Semiconductors do not obey Ohm's law Statement-II : El...

    Text Solution

    |

  11. Statement-I : Germanium is preferred over silicon for making semicondu...

    Text Solution

    |

  12. Assertion : p-n junction diode can be used even at ultra high frequenc...

    Text Solution

    |

  13. Statement-I : A p-n junction with reverse bias can be used as a photod...

    Text Solution

    |

  14. Assertion: NAND or NOR gates are called digital building blocks. Rea...

    Text Solution

    |

  15. Assertion: Two P-N junction diodes placed back to back, will work as a...

    Text Solution

    |

  16. Statement-I : When base region has larger width, the collector current...

    Text Solution

    |

  17. Statement-I : For faster action, n-p-n transistor is used Statement-...

    Text Solution

    |

  18. Statement-I : To be used as amplifier, the transistor in the common em...

    Text Solution

    |

  19. Statement-I : Many channels get allowed when transmission frequency is...

    Text Solution

    |

  20. Statement-I : Optical fibres are free from electromagnetic disturbance...

    Text Solution

    |