Home
Class 12
PHYSICS
Work function of a metal is 4.0 eV. Its ...

Work function of a metal is 4.0 eV. Its threshold wavelength will be approximately

A

4000 Å

B

3100 Å

C

2500 Å

D

3600 Å

Text Solution

Verified by Experts

The correct Answer is:
B
Since `(hc)/(elamda_(0))=phi_(0)` (in eV) and `phi_(0)=4.0eV`
`implies lamda_(0)=(hc)/(ephi_(0))=(6.63xx10^(-34)xx3xx10^(8))/(1.6xx10^(-19)xx4.0)=3.1xx10^(-7)m` or 3100 Å
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    U-LIKE SERIES|Exercise FILL IN THE BLANKS|15 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    U-LIKE SERIES|Exercise TRUE OR FALSE|8 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    U-LIKE SERIES|Exercise CASE BASED/SOURCE-BASED INTEGRATED QUESTIONS|10 Videos

  • CURRENT ELECTRICITY

    U-LIKE SERIES|Exercise SELF ASSESSMENT TEST (SECTION C )|3 Videos

  • ELECTRIC CHARGES AND FIELDS

    U-LIKE SERIES|Exercise SELF ASSESSMENT TEST (SECTION-B) (VERY SHORT ANSWER QUESTIONS)|4 Videos

Similar Questions

Explore conceptually related problems

The work function of a metal is 4.2 eV , its threshold wavelength will be

If the work function of a photo - metal is 6.825 eV . Its threshold wavelength will be ( c = 3 xx 10^(8) m//s)

Work funciton of a metal is 2.51eV. It threshold frequency is

The work function of Na metal is 2.3 eV , then the threshold wavelength lies in the following region of EM spectrum -

The work function of two metals metal A and metal B are 6.5 eV and 4.5 eV respectively. If the threshold wavelength of metal A is 2500 A, the threshold wavelength on metal B will be approximately equal to

The work function for a metal whose threshold wavelength is 5000 Å is

The work function of sodium is 2.3 eV . The threshold wavelength of sodium will be

The work function of a metal is 4 eV. What should be the wavelength of the incident radiation for the emission of photoelectrons of zero velocity ?

Sodium and copper have work functions of 2.3 eV and 4.5 eV. The ratio of their corresponding threshold wavelengths will be approximately equal to

U-LIKE SERIES-DUAL NATURE OF RADIATION AND MATTER-MULTIPLE CHOICE QUESTIONS
  1. The number of photoelectrons emitted for light of a frequency v (hiigh...

    Text Solution

    |

  2. Which of these particles (having the same kinetic energy) has the shor...

    Text Solution

    |

  3. The potential difference that must be applied to stop the fastest phot...

    Text Solution

    |

  4. A source S1, is producing 10^(15) photons per second of wavelength 500...

    Text Solution

    |

  5. Huygen's wave theory of light cannot explain

    Text Solution

    |

  6. The threshold wavelength for photoelectric emission from a material is...

    Text Solution

    |

  7. Work function of a metal is 4.0 eV. Its threshold wavelength will be a...

    Text Solution

    |

  8. UV radiations of 6.2 eV fall on an aluminium surface whose work functi...

    Text Solution

    |

  9. The work function of a photoelectric material is 3.3 V. the threshold ...

    Text Solution

    |

  10. The maximum kinetic energy of photoelectrons emitted from a surface, w...

    Text Solution

    |

  11. A photoelectric cell gives zero current when maintained at 2V negative...

    Text Solution

    |

  12. Light of two different frequencies, whose photons have energies 2eV an...

    Text Solution

    |

  13. Sodium and copper have work functions of 2.3 eV and 4.6 eV respectivel...

    Text Solution

    |

  14. In photoelectric effect the maximum kinetic energy of electrons emitte...

    Text Solution

    |

  15. Threshold frequency for photosensitive material is v(0). If photons of...

    Text Solution

    |

  16. The wavelength of the matter wave associated with a particle is indepe...

    Text Solution

    |

  17. A protom and an alpha particle are both accelerated through a potentia...

    Text Solution

    |

  18. An electron of mass m, when accelerated through a potential difference...

    Text Solution

    |

  19. The de-Broglie wavelength of a neutron at 27^(@)C is lamda, what will ...

    Text Solution

    |

  20. The wavelength of de-Broglie wave associated with a matter particle is...

    Text Solution

    |