Home
Class 12
PHYSICS
Two metals A and B have work functions 4...

Two metals A and B have work functions 4 eV and 10 eV respectively. Which metal has higher threshold wavelength?

Text Solution

Verified by Experts

Work function, `phi_0=(hc)/(lambda_0)`, where `lambda_0` is the threshold wavelength. So, `lambda_0 prop 1//phi_0`. It means a metal with lower work function has higher threshold wavelength.
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    PRADEEP|Exercise NCERT Exerciese question|1 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    PRADEEP|Exercise Short answer|1 Videos

  • CURRENT ELECTRICITY

    PRADEEP|Exercise Problems for Practice (B)|2 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    PRADEEP|Exercise Multiple Choice Questions|1 Videos

Similar Questions

Explore conceptually related problems

Two metals A and B have work function 2 eV and 4 eV , respectively . Which metal has a lower threshold wavelength for photoelectric effect ?

Two metals a and b have work function 5 eV and 7 eV , respectively . Which metal has a lower threshold wavelength ?

Work functions for metals A and B are 2 eV and 4 eV respectively. Which metal has a lower threshold wavelength and why ?

Light of wavelength 3500Å is incident on two metals A and B whose work functions are 3.2 eV and 1.9 eV respectively. Which metal will emit photoelectrons

Work functions of caesium and lead are 2.14 eV and 4.25 eV respectively. Which of the two has a higher threshold wavelength ?

Sodium and copper have work functions 2.3 eV and 4.6 eV respectively . Then the ratio of threshold wavelengths are respectively.

Photons of energy 7 eV are incident on two metals A and B with work functions 6 eV and 3 eV respectively. The minimum de Broglie wavelengths of the emitted photoelectrons with maximum energies are lambda_A and lambda_B , respectively where lambda_A // lambda_B is nearly

PRADEEP-DUAL NATURE OF RADIATION AND MATTER-Exercise
  1. Two metals A and B have work functions 4 eV and 10 eV respectively. Wh...

    Text Solution

    |

  2. The photoelectric effect can be explained on the basis of

    Text Solution

    |

  3. Which of the following has minimum stopping potential?

    Text Solution

    |

  4. When radiation is incident on a photoelectron emitter, the potential i...

    Text Solution

    |

  5. Two photons, each of energy 2.5 eV are simultaneously incident on the ...

    Text Solution

    |

  6. The maximum velocity of an electron emitted by light of wavelength lam...

    Text Solution

    |

  7. The photoelectric work function for a metal surface is 4.125 eV. The c...

    Text Solution

    |

  8. The slope of frequency of incident light and stopping potential for a ...

    Text Solution

    |

  9. Threshold wavelength for a metal having work function w(0) is lambda. ...

    Text Solution

    |

  10. The work function for metals A , B and C are respectively 1.92 eV , 2....

    Text Solution

    |

  11. The wavelength of the matter wave is independent of

    Text Solution

    |

  12. If E(1), E(2), E(3), E(4) are the respective kinetic energies of elect...

    Text Solution

    |

  13. What is de-Broglie wavelength assciated with electron moving under a ...

    Text Solution

    |

  14. The minimum energy required by an electron to..........form the metal ...

    Text Solution

    |

  15. The maximum kinetic energy of emitted photoelectrons depends on the......

    Text Solution

    |

  16. The ratio of number of photoelectrons ejected to the number of the pho...

    Text Solution

    |

  17. For given photosenstive material, the photoelectric current is...........

    Text Solution

    |

  18. An increase in the frequency of the incident light.............the vel...

    Text Solution

    |

  19. The minimum energy required to ejected an electron from the surface of...

    Text Solution

    |

  20. In photoelectric effect the energy of the free electron does not depen...

    Text Solution

    |

  21. Photon is not a..........but it is a.......... .

    Text Solution

    |