Home
Class 12
PHYSICS
The work function of a metal surface for...

The work function of a metal surface for electron emission is W. What will be the threshold frequency of incident radiation for photoelectric emission?

Text Solution

Verified by Experts

The correct Answer is:
`(W)/(h)`
Promotional Banner

Topper's Solved these Questions

  • QUANTUM THEORY

    CHHAYA PUBLICATION|Exercise Exercise (Short Answer Type Questions- I)|18 Videos

  • QUANTUM THEORY

    CHHAYA PUBLICATION|Exercise Exercise (Short Answer Type Questions- II)|4 Videos

  • QUANTUM THEORY

    CHHAYA PUBLICATION|Exercise Exercise (Multiple Choice Questions)|27 Videos

  • OPTICAL INSTRUMENTS

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|8 Videos

  • QUESTION PAPER OF NEET 2017

    CHHAYA PUBLICATION|Exercise QUESTION PAPERS OF (NEET) (2017)|39 Videos

Similar Questions

Explore conceptually related problems

work function for electronic emission from sodium is 1.77 eV. What is the threshold frequency of incident radiation for photon-emission from sodium?

What is threshold frequency in connecting with photoelectric effect?

What is threshold frequency in photoelectric emission?

The work function of a metal surface is 2.0 eV. Light of wavelength 5000 Å is incident on it:

Calculate the threshold frequency of photon for photoelectric emission from a metal of work function 0.1eV.

Stopping poential for the electrons emitted due to incidence of light on a metal is 3V. Determine the frequency of this light and also the work function for metal. Given, the threshold frequency for photoelectric emission from that metal is 6xx10^(14) Hz .

The threshold wavelength of a metal having work function W is lamda . What will be the threshold wavelength of a metal having work function 2W ?

Einstein's equation for photoelectric effect is E_("max") = hf - W_(0) , where h = Planck's constant = 6.625 xx 10^(-34) J.s, f = frequency of light incident on metal surface, W_(0) = work function of metal and E_("max") = maximum kinetic energy of the emitted photoelectrons. It is evident that if the frequency f is less than a minimum value f_(0) or if the wavelength lamda is greater than a maximum value lamda_(0) , the value of E_("max") would be negative, which is impossible. Thus for a particular metal surface f_(0) is the threshold frequency and lamda_(0) is the threshold wavelength for photoelectric emssion to take place. Again if the collector plate is ketp at a negative potential with respect to the emitter plate, the velocity of the photoelectrons would decrease. The minimum potential for which the velocity of the speediest electron becoes zero, is known as the stopping potential, the photoelectric effect stops for a potential lower than this. [velocity of light = 3xx 10^(8) m.s^(-1) , mass of an electron m = 9.1 xx 10^(-31) kg , charge of an electron, e = 1.6 xx 10^(-19)C The threshold wavelength of photoelectric effect for a metal surface is 4600 Å . Work function of the metal (in eV) is

CHHAYA PUBLICATION-QUANTUM THEORY-Exercise (Very Short Answer Types Questions)
  1. Which property of light is used to explain the characteristics of phot...

    Text Solution

    |

  2. What is the rest mass of a photons?

    Text Solution

    |

  3. The wavelength of an electromagnetic radiation is lamda. What is the e...

    Text Solution

    |

  4. The light coming from a hydrogen-filled discharge tube falls on sodium...

    Text Solution

    |

  5. In case of photoelectric emission, the maximum kinetic energy of emitt...

    Text Solution

    |

  6. In case of electromagnetic radiation of frequency f, what is the momen...

    Text Solution

    |

  7. If photons of energy 6eV are incident on a metallic surface, the kinet...

    Text Solution

    |

  8. The threshold wavelength of a metal having work function W is lamda. W...

    Text Solution

    |

  9. The work function of a metal surface for electron emission is W. What ...

    Text Solution

    |

  10. What is the effect on the velocity of the emitted photoelectrons if th...

    Text Solution

    |

  11. Two metals A and B have work function 4eV and 10eV respectively. Which...

    Text Solution

    |

  12. Ultravilet light is incident on two photosensitive materials having wo...

    Text Solution

    |

  13. Is it possible to bring about interference of electron?

    Text Solution

    |

  14. What type of wave is suitable to represent the wave associated with a ...

    Text Solution

    |

  15. Davission and Germer experimentally demonstrated the existence of wav...

    Text Solution

    |

  16. The wavelength of a stream of charged particles accelerated by a volta...

    Text Solution

    |

  17. The de Broglie wavelength of an electron and the wavelength of a photo...

    Text Solution

    |

  18. An electron and a proton have the same kinetic energy. Identify the pa...

    Text Solution

    |

  19. The de Broglie wavelength of a particle of kinetic energy K is lamda. ...

    Text Solution

    |

  20. The de Broglie wavelength associated with an electron accelerated thro...

    Text Solution

    |