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

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" )`

A

`2 hc xx 10^(6) J`

B

`1.5 hc xx 10^(6) J`

C

`hc xx 10^(6) J`

D

`0.5 hc xx 10^(6) J `

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS AND PHOTONS

    TARGET PUBLICATION|Exercise Evaluation Test|19 Videos

  • ELECTRONS AND PHOTONS

    TARGET PUBLICATION|Exercise Critical thinking|22 Videos

  • COMMUNICATION SYSTEMS

    TARGET PUBLICATION|Exercise Evaluation Test|15 Videos

  • ELECTROSTATICS

    TARGET PUBLICATION|Exercise EXCERCISE|156 Videos

Similar Questions

Explore conceptually related problems

A photoelectric surface is illuminated successively by monochromatic light of wavelength lambda and (lambda)/(2) . If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times than in the first case , the work function of the surface of the material is ( h = Plank's constant , c = speed of light )

A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are mu_1 and mu_2 respectively. If the ratio u_1: u_2 = 2:1 and hc= 1240 eV , the work function of the metal is nearly.

Two identical photo-cathodes receive light of frequencies f_1 and f_2 . If the velocities of the photoelectrons (of mass m) coming out are v_1 and v_2 respectively, then

When light of wavelength 6000oerset@A falls on a metal surface, photoelectrons are emitted from it with a velocity of 2 xx 10^5ms-1 .Calculate the work function of the metal in eV.

Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electron doubles when light of wavelength 400 nm is used. Find the work function in eV.

The work function of a metal is 1.6 xx 10^-19J . The metal surface is illuminated by light of wavelength 6400overset@ A . What will be the maximum kineticenergy of photoelectrons emitted.

TARGET PUBLICATION-ELECTRONS AND PHOTONS-Competitive Thinking
  1. The momentum of a photon is 2 xx 10^(-16) gm - cm//sec. Its energy is

    Text Solution

    |

  2. If the energy of a photon corresponding to a wavelength of 6000 Å is ...

    Text Solution

    |

  3. If we express the energy of a photon in KeV and the wavelength in angs...

    Text Solution

    |

  4. A metal surface of work function 1.07 eV is irradiated with light of w...

    Text Solution

    |

  5. The work function of metal is 1 eV. Light of wavelength 3000 Å is inc...

    Text Solution

    |

  6. Energy from the sun is recived on earth at the rate of 2 cal per cm^(2...

    Text Solution

    |

  7. when a monochromatic point source of light is at a distance 0.2 m from...

    Text Solution

    |

  8. When a metal surface is illuminated by light wavelengths 400 nm and 25...

    Text Solution

    |

  9. The velocity of the most energetic electrons emitted from a metallic s...

    Text Solution

    |

  10. A modern 200 W sodium street lamp emits yellow light of wavelength 0.6...

    Text Solution

    |

  11. Ultraviolet light of wavelength 300nn and intensity 1.0Wm^-2 falls on ...

    Text Solution

    |

  12. The number of photons falling per second on a completely darkened plat...

    Text Solution

    |

  13. Photoelectric emission is observed from a metallic surface for frequen...

    Text Solution

    |

  14. A photoelectric surface is illuminated successively by monochromatic l...

    Text Solution

    |

  15. Two identical photo-cathodes receive light of frequencies f1 and f2. ...

    Text Solution

    |

  16. A metal surface is illuminated by light of two different wavelengths 2...

    Text Solution

    |

  17. A photon of energy E ejects a photoelectron from a metel surface whose...

    Text Solution

    |

  18. Light of wavelength lambda(A) and lambda(B) falls on two identical met...

    Text Solution

    |

  19. The energy of the electromagetic wave is of the order of 15 keV. To wh...

    Text Solution

    |

  20. The photoelectric work function of a surface is 2.2 eV. The maximum ki...

    Text Solution

    |