Home
Class 11
PHYSICS
When a metal surface is illuminated by a...

When a metal surface is illuminated by a monochromatic light of wave-length `lambda`, then the potential difference required to stop the ejection of electrons is `3V`. When the same surface is illuminated by the light of wavelength `2lambda`, then the potential difference required to stop the ejection of electrons is `V`. Then for photoelectric effect, the threshold wavelength for the metal surface will be

A

`6 lambda`

B

`4lambda//3`

C

`4lambda`

D

`8lambda`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS AND PHOTONS

    TARGET PUBLICATION|Exercise Competitive Thinking|80 Videos

  • COMMUNICATION SYSTEMS

    TARGET PUBLICATION|Exercise Evaluation Test|15 Videos

  • ELECTROSTATICS

    TARGET PUBLICATION|Exercise EXCERCISE|156 Videos

Similar Questions

Explore conceptually related problems

When monochromatic light of wavelength lambda is incident on a metallic surface the stopping potential for photoelectric current is 3V_(0) when same surface is illuminated with light of waelength 2lambda the stopping potential is V_(0) The threshold wavelength for this surface when photoelectric effect takes place is

A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm . The retarding potential required to stop the escape of photo - electrons is

When a metallic surface is illuminated with radiation of wavelength lambda , the stopping potential is V . If the same surface is illuminated with radiation of wavelength 2 lambda , the stopping potential is (V)/(4) . The threshold wavelength surface is :

In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V . If the incident light is changed to 3000 Å , then the potential required to stop the ejection of electrons will be

TARGET PUBLICATION-ELECTRONS AND PHOTONS-Evaluation Test
  1. Relation between the stopping potential V0 of a metal and the maximum ...

    Text Solution

    |

  2. Radiation of wavelength 120 nm ejects photoelectrons from a plate whos...

    Text Solution

    |

  3. A surface receives light of wavelength lambda1=450 nm, causing the eje...

    Text Solution

    |

  4. Assertion: Photons can exist at rest. Reason: Rest mass m0=msqrt(((1...

    Text Solution

    |

  5. When a monochromatic point source of light is at a distance of 0.2 m f...

    Text Solution

    |

  6. Assertion: Work function of a metal is 4 eV. The maximum wavelength of...

    Text Solution

    |

  7. Eye of an experimenter detects the green light (lambda =5000 Å) at 5xx...

    Text Solution

    |

  8. Photon having wavelength lambda = 3.5xx10^(-7)m and lambda = 5.4xx10^(...

    Text Solution

    |

  9. Illuminating a metal surface alternately with wavelengths lambda1 and ...

    Text Solution

    |

  10. In a photoelectric effect, the anode potential is plotted against the ...

    Text Solution

    |

  11. A proton when accelerated through a potential difference of V volt has...

    Text Solution

    |

  12. The work function for the following metals is given Na: 2.75 eV, K:2.3...

    Text Solution

    |

  13. Assertion: Work function of a metal is proportional to maximum wavelen...

    Text Solution

    |

  14. The retarding potential for having zero photoelectron current

    Text Solution

    |

  15. A proton and an alpha-particle are accelerated through same potential ...

    Text Solution

    |

  16. Light of wavelength 3000 Å falls on a sensitive surface. If the surfac...

    Text Solution

    |

  17. The work function for aluminium is 4.125 eV. The cut-off wavelength fo...

    Text Solution

    |

  18. Lights of two different frequencies whose photons have energies 1 eV a...

    Text Solution

    |

  19. When a metal surface is illuminated by a monochromatic light of wave-l...

    Text Solution

    |