Home
Class 12
PHYSICS
When the incident wavelengths are lamda ...

When the incident wavelengths are `lamda` and `lamda//2` the kinetic energies of the emitted photo electrons are E and 2E. The work function of the metal is

A

E/4

B

E/2

C

E/3

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH SERIES|Exercise EXERCISE=II|42 Videos
  • CURRENT ELECTRICITY

    AAKASH SERIES|Exercise EXERCISE - III|73 Videos
  • ELECTRIC CHARGES AND FIELDS

    AAKASH SERIES|Exercise Practice Exercise|57 Videos
AAKASH SERIES-DUAL NATURE OF RADIATION AND MATTER-PRACTICE EXERCISEX
  1. Two sources A and B have same power. The wavelength of radiation of A ...

    Text Solution

    |

  2. The photo electric threshold wavelength for a metal is 2750A^(@), The ...

    Text Solution

    |

  3. When the incident wavelengths are lamda and lamda//2 the kinetic energ...

    Text Solution

    |

  4. A 1000W transmitter works at a frequency 880 kHz. The number of photon...

    Text Solution

    |

  5. The threshold wavelength for photo electric emission from a material i...

    Text Solution

    |

  6. Light of wavelength 4000A^(@) is incident on a potassium surface whose...

    Text Solution

    |

  7. Monochromatic light incident on a metal surface emits electron with K....

    Text Solution

    |

  8. Three metals have work functions in the ratio 2 3:4. Graphs are drawn ...

    Text Solution

    |

  9. Two photons of energies twice and thrice the work function of a metal ...

    Text Solution

    |

  10. The work function of a substance is 4eV. The longest wavelength of lig...

    Text Solution

    |

  11. The photo electric work function of a metal is 1 eV. Light of wave len...

    Text Solution

    |

  12. When a mono chromatic point source of light is at a distance of 0.2m f...

    Text Solution

    |

  13. The work function of a substance is 12.4 eV. The longest wavelength of...

    Text Solution

    |

  14. A surface irradiated with light of wave length 480 nm gives out electr...

    Text Solution

    |

  15. The photoelectric threshold wavelength for a certain metal is 4000A^(@...

    Text Solution

    |

  16. What P.D. must be applied to stop the fastest photo electron emitted b...

    Text Solution

    |

  17. The threshold frequency for photo electric effect for a metal surface ...

    Text Solution

    |

  18. The work functions of metals A and B are in the ratio 1 : 2. If light ...

    Text Solution

    |

  19. When a metal surface is illuminated by a light of wavelength 400nm and...

    Text Solution

    |

  20. V(1) and V(2) are the stopping potentials for the incident radiations ...

    Text Solution

    |