Home
Class 11
PHYSICS
The maximum velocity of an electron emit...

The maximum velocity of an electron emitted by light of wavelength `lambda` incident on the surface of a metal of work function `phi`, is
Where h = Planck's constant , m = mass of electron and c = speed of light.

A

`sqrt((2(hc+lamdaphi))/(mlamda))`

B

`(2(hc+lamdaphi))/(m lamda)`

C

`sqrt((2(hc-lamdaphi))/(m lamda))`

D

`sqrt((2(h lamda-phi))/(m))`

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DISHA|Exercise PHYSICS|45 Videos

  • ELECTRIC CHARGE AND FIELDS

    DISHA|Exercise Physics|42 Videos

Similar Questions

Explore conceptually related problems

Light of wavelength 3000Å is incident on a metal surface whose work function is 1 eV. The maximum velocity of emitted photoelectron will be

The energy of a photon of wavelength lambda is [ h = Planck's constant, c = speed of light in vacuum ]

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 )

If V_1 and V_2 are stopping potentials for incident photons of wavelengths lambda_1 andlambda_2 for same cathode material, then Planck's constant is given by [e = charge on electron, c = speed of light]

Show that h/(m_0c) is of the dimensions of length where h is Planck constant , m_0 , rest mass and c, velocity of light.

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 500 nm is incident on a metal with work function 2.28 eV . The de Broglie wavelength of the emitted electron is

Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is

Light of wavelength 3320 Å incidents on metal surface (work function = 1.07 eV ). To stop emission of photo electron, retarding potential required to be -

DISHA-DUAL NATURE OF MATTER AND RADIATION-PHYSICS
  1. When photons of energy hv fall on an aluminium plate (of work function...

    Text Solution

    |

  2. The work functions for sodium and copper are 2 eV and 4 eV . Which of ...

    Text Solution

    |

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

    Text Solution

    |

  4. If the kinetic energy of a free electron doubles , its de - Broglie wa...

    Text Solution

    |

  5. Radiations of two photon’s energy, twice and ten times the work functi...

    Text Solution

    |

  6. The cathode of a photoelectric cell is changed such that the work func...

    Text Solution

    |

  7. Monochromatic radiation emitted when electron on hydrogen atom jumps f...

    Text Solution

    |

  8. Photoelectric work- function of a metal is 1 eV. Light of wavelength l...

    Text Solution

    |

  9. When the energy of the incident radiation is increased by 20 % , kinet...

    Text Solution

    |

  10. The maximum distance between interatomic lattice planes is 15 Å. The m...

    Text Solution

    |

  11. In photoelectric effect, stopping potential for a light of frequency n...

    Text Solution

    |

  12. The maximum kinetic energy of the photoelectrons ejected from a photoc...

    Text Solution

    |

  13. The work functions of metals A and B are in the ratio 1 : 2. If light ...

    Text Solution

    |

  14. Which one of the following graphs represents the variation of maximum ...

    Text Solution

    |

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

    Text Solution

    |

  16. X- rays are produced in an X- rays tube operating at a given accelerat...

    Text Solution

    |

  17. Electrons used in an electron microscope are accelerated by a voltage ...

    Text Solution

    |

  18. In the Davisson and Germer experiment , the velocity of electrons emit...

    Text Solution

    |

  19. Lights of two different frequencies whose photons have energies 1 and ...

    Text Solution

    |

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

    Text Solution

    |