Home
Class 12
PHYSICS
The work function for sodium surface is ...

The work function for sodium surface is 2.0eV and that for aluminium surface is 4.2eV. The two metals are illuminated with appropriate radiations so as to cause protoemission. Then

A

Both aluminium and sodium will have the same threshold frequency

B

The threshold freqency of aluminium will be more than that of sodium

C

The threshold freqency of aluminium will be less than that of sodium

D

The threshold wavelength of aluminium will be more than that of sodium

Text Solution

Verified by Experts

The correct Answer is:
B
The threshold frequency for `AI` must be greater as it has higher work function. (`because W=hv_(0)`)
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE

    NARAYNA|Exercise LEVEL-VI|21 Videos

  • DUAL NATURE

    NARAYNA|Exercise LEVEL-I(H.W)|7 Videos

  • DUAL NATURE

    NARAYNA|Exercise NCERT BASED QUES.|26 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NARAYNA|Exercise ASSERTION AND REASON|15 Videos

  • ELECTRIC CHARGES AND FIELDS

    NARAYNA|Exercise EXERCISE -4|43 Videos

Similar Questions

Explore conceptually related problems

The work function for aluminium surface is 4.2 eV and that for sodium surface is 2.0 eV. The two metals were illuminated with appropriate radiations so as to cause photo emission. Then :

The photoelectric work function for a metal surface is 4.125 eV . The cut - off wavelength for this surface is

The work function for a metal surface is 2.0 eV. Determine the longest wavelength that will eject photoelectrons from the metal surface.

The work function of a metal surface is 4.2 eV. The maximum wavelength which can eject electrons from this metal surface is

The energy required to remove an electron from an aluminium surface is 4.2 eV. If two photons, each of energy 3.0 eV, strike an electron of aluminium, the emission of photoelectrons will

The photoelectric work function for aluminium is 4.2 eV. What is the stopping potential for radiation of wavelength 2500 Å ?

The work function of a metal is 2.5 eV. Light of wavelength 3600 Å is incident on this metal surface. The velocity of emitted photoelectrons will be

The work function for a metal is 4eV. To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be :

NARAYNA-DUAL NATURE-LEVEL-V
  1. When monochromatic radiation of intensity I falls on a metal surface, ...

    Text Solution

    |

  2. The frequency and intensity of a light source are both doubled. Consid...

    Text Solution

    |

  3. The work function for sodium surface is 2.0eV and that for aluminium s...

    Text Solution

    |

  4. A point source of light is used in a photoelectric effect. If the sour...

    Text Solution

    |

  5. A point source causes photoelectric effect from a small metal plate. W...

    Text Solution

    |

  6. We may state that the energy E of a photon of frequency nu is E =hnu, ...

    Text Solution

    |

  7. A particle of mass M at rest dacays into two particle of masses m(1) a...

    Text Solution

    |

  8. Let p and E denote the linear momentum and energy of a photon. If the ...

    Text Solution

    |

  9. The wavelength lambda of de Broglie waves associated with an electron ...

    Text Solution

    |

  10. Two particles of masses m and 2m have equal kinetic energies. Their de...

    Text Solution

    |

  11. The wavelength of de-Broglie wave associated with a thermal neutron of...

    Text Solution

    |

  12. A proton and an electron are accelerated by the same potential differe...

    Text Solution

    |

  13. Photoelectric effect supports quantum nature of light because (a) th...

    Text Solution

    |

  14. When photons of energy 4.25 eV strike the surface of metal A, the ejec...

    Text Solution

    |

  15. The graph between the stopping potential (V(0)) and ((1)/(lambda)) is...

    Text Solution

    |

  16. When a monochromatic point source of light is at a distance of 0.2 m f...

    Text Solution

    |

  17. The collecter of the photocell (in photoelectric experiment ) is made ...

    Text Solution

    |

  18. The collecter of the photocell (in photoelectric experiment ) is made ...

    Text Solution

    |

  19. The collecter of the photocell (in photoelectric experiment ) is made ...

    Text Solution

    |

  20. In a photoelectric effect set up, a point source of light of power 3.2...

    Text Solution

    |