Home
Class 12
PHYSICS
Why are alkali metal surfaces most suite...

Why are alkali metal surfaces most suited as photo-sensitive surfaces?

Text Solution

Verified by Experts

Because their work function is very low . Less energy is required to eject the electrons from alkali metals.
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    MODERN PUBLICATION|Exercise Revision Exercises (Additional Questions)|8 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    MODERN PUBLICATION|Exercise Revision Exercises (Fill in the Blanks)|11 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    MODERN PUBLICATION|Exercise Higher Order Thinking Skills & Advanced Level (QUESTIONS WITH ANSWERS)|8 Videos

  • CURRENT ELECTRICITY

    MODERN PUBLICATION|Exercise Chapter Practice Test|15 Videos

  • ELECTRIC CHARGES AND FIELDS

    MODERN PUBLICATION|Exercise Chapter Practice Test|15 Videos

Similar Questions

Explore conceptually related problems

Why are alkali metals so named?

Why are alkali metals not found in nature?

Why are alkali metals difficult to be reduced?

Why are alkali metals not found free in nature ?

Why do alkali metal tarnishes in air?

When orange light falls on a photo sensitive surface the photocurrent begins to flow. The velocity of emitted electrons will be more whwn surface is hit by

STATEMENT.1 Photo-omission from a photosensitive surface is possible only if the incident radiation has a frequency above threshold frequency. STATEMENT-2: Unless, the energy of incident photo is greater than the work function of photo- sensitive surface, no photoemission is possible.

MODERN PUBLICATION-DUAL NATURE OF RADIATION AND MATTER -Revision Exercises (Very Short Answer Questions)
  1. An electron and proton are possessing the same amount of kinetic energ...

    Text Solution

    |

  2. What will be the de Broglie wavelength associated with a ball of mass ...

    Text Solution

    |

  3. What would be the de Broglie wavelength of an electron possessing 100 ...

    Text Solution

    |

  4. Plot a graph showing variation of a de Broglie wavelength (lamda) asso...

    Text Solution

    |

  5. Write the expression for the de-Broglie wavelength associated with a c...

    Text Solution

    |

  6. The two lines A and B in fig. show the photo electron of de Broglie wa...

    Text Solution

    |

  7. Two metals a and b have work function 5 eV and 7 eV , respectively . W...

    Text Solution

    |

  8. Ultraviolet light is incident on two photosensitive materials having w...

    Text Solution

    |

  9. What do you mean by photoelectric efficiency ?

    Text Solution

    |

  10. Can photoelectric efficiency be greater than One (1) ?

    Text Solution

    |

  11. The de Broglie wavelength lambda of a particle

    Text Solution

    |

  12. Why are alkali metal surfaces most suited as photo-sensitive surfaces?

    Text Solution

    |

  13. Explain giving reasons for the following : (a) Photoelectric current...

    Text Solution

    |

  14. The stopping potential in an experiment on a photo electric effect is ...

    Text Solution

    |

  15. The energy that should be added to an electron, to reduce its de-Brogl...

    Text Solution

    |

  16. In Davisson - Germer experiment , find the glancing angle if the anlge...

    Text Solution

    |

  17. Plot a graph of the de - Broglie wavelength associated with electron a...

    Text Solution

    |

  18. An electron and alpha particle have the same de-Broglie wavelength as...

    Text Solution

    |

  19. Which of the following pheniomeana exhibits particle nature of light ?

    Text Solution

    |

  20. Maximum kinetic energy of photoelectron depends on

    Text Solution

    |