Home
Class 12
PHYSICS
The surface of a metal is illuminated wi...

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photo electrons was found to be 1.68 eV. The work function of the metal is `(h_(c)=1240eV.nm)`

A

1.41 eV

B

1.51eV

C

1.68eV

D

3.09 eV

Text Solution

Verified by Experts

The correct Answer is:
A
Here `lamda=400nm and K_(max)=1.68eV. " "therefore` Energy of incident light photon `E=(hc)/(lamda)=(1240)/(400)eV=3.1eV`
As `E=phi_(0)+K_(max),` hence `phi_(0)=E-K_(max)=3.1-1.68=1.42eV`
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 surface of a metal illuminated with the light of 400 nm . The kinetic energy of the ejected photoelectrons was found to be 1.68 eV . The work function of the metal is : (hc=1240 eV.nm)

The surface of a metal is illuminted with the light of 400 nm The kinetic energy of the ejection photoelectron was found to be 1.68 eV The work function of the metal is :

Wave property of electrons implies that they will show diffraction effects. Davission and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure) The surface of a metal is illuminated with the light of 400 nm . The kinetic energy of the ejected photoelectrons was found to be 1.68 eV . The work function of the metal is : ( hc = 1240 eV-nm )

The surface of a metal is illuminated with light of wavelength 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. What is the work function of the metal ? [ hC=1240 eV*nm ]

A light of wavelength 600 nm is incident on a metal surface. When light of wavelength 400 nm is incident, the maximum kinetic energy of the emitted photoelectrons is doubled. The work function of the metals is

When the wavelength of radiation falling on a metal is changed from 500 nm to 200 nm, the maximum kinetic energy of the photo electrons becomes three times larger. The work function of the metal is close to :

A photon iof light with lambda = 470nm falls on a metal surface .As a result photoelectron are ejected with a velocity of 6.4 xx 10^(4) ms^(-1) .Find a. The kinetic energy of emited photonelectron b. The work function (in eV) of the metal surface

When a metal surface is illuminated by light wavelengths 400 nm and 250 nm , the maximum velocities of the photoelectrons ejected are upsilon and 2 v respectively . The work function of the metal is ( h = "Planck's constant" , c = "velocity of light in air" )

Light of wavelength 4000 Å is incident on a metal surface. The maximum kinetic energy of emitted photoelectron is 2 eV. What is the work function of the metal surface ?

U-LIKE SERIES-DUAL NATURE OF RADIATION AND MATTER-MULTIPLE CHOICE QUESTIONS
  1. A proton, a neutron, an electron and an alpha particle have some energ...

    Text Solution

    |

  2. A particle of mass 1 mg has the same wavelength as an electron moving ...

    Text Solution

    |

  3. The surface of a metal is illuminated with the light of 400 nm. The ki...

    Text Solution

    |

  4. Photon of frequency v has a momentum associated with it. If c is the v...

    Text Solution

    |

  5. The number of photoelectrons emitted for light of a frequency v (hiigh...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  9. Huygen's wave theory of light cannot explain

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |