Home
Class 12
PHYSICS
In photoelectric effect threshold wavele...

In photoelectric effect threshold wavelength of sodium is 5000Å .Find its work function.
[`h=6.6xx10^(-34)Js,c=3xx10^(8)m//s,1eV=1.6xx10^(-19)Js]`

A

2.5 eV

B

5.0 eV

C

7.5 eV

D

10 eV

Text Solution

Verified by Experts

The correct Answer is:
A
`phi=(hc)/(lambdae)=(6.6xx10^(-34)xx3xx10^(8))/(5xx10^(-7)xx1.6xx10^(-19))`
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (MCQs asked in GUJCET/Board Exam)|1 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (MCQs asked in CBSE-PMT,AIPMT,NEET)|1 Videos

  • CURRENT ELECTRICITY

    KUMAR PRAKASHAN|Exercise SECTION [D] MULTIPLE CHOICE QUESTIONS (MCQs) (MCQs ASKED IN BOARD EXAM AND GUJCET)|23 Videos

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION D MCQS ASKED IN COMPETITIVE EXAMES (MCQS AKSED IN BOARD EXAM AND GUJCET)|14 Videos

Similar Questions

Explore conceptually related problems

The threshold wavelength of Na element is 6800 Å.Its work function is ………. xx10^(-19)J.(h=6.625xx10^(-34)Js,C=3xx10^(8)ms^(-1))

The photoelectric threshold wavelength for Potassium having work function of 2eV is.......... (Take h= 6.6 xx 10^(-34) J s. 1 eV = 1.6 xx 10^(-19) J , C = 3 xx 10^8 Ms^(-1) )

Wavelength of photon having 35 keV energy will be…….. (h=6.625xx10^(-34))J-s,c=3xx10^(8)ms^(-1),1eV=1.6xx10^(-19)J) .

The wavelength of photon having energy of 35 keV is …….. (h=6.625xx10^(-34)J-s, c=3xx10^(8)ms^(-1), 1eV=1.6xx10^(-19)J) .

Work function of metal is 1.6 eV for which maximum wavelength photoelectric emission can be obtained ? [h=6.6xx10^(-34)JS,c=3xx10^(8)m//s]eV=1.6xx10^(-19) J]

When the electromagnetic radiation of maximum wavelength of 2480 nm is incident on semiconductor. The band gap energy of semiconductor is ……eV. [6.6xx10^(-34)JS, C=3xx10^(8)m//s, 1eV=1.6xx10^(-19)J]

Work function of metal A,B and C are 4.5 eV 4.3 eV and 3.8eV respectively .If radiation of 3000 Å is incident on it then …..( h=6.62xx10^(-34)js,c=3xx10^(8)m//s,1 eV1.6xx10^(-19)C)

Ultraviolet light of 200 nm wavelength is incident on polished surface of iron .Its work function is 4.71 eV what will be value of stopping potential? [h=6.626xx10^(-34)]JSc=3xx10^(8)m//s1eV=1.6xx10^(-19)J ]

The threshold frequency of cesium is 5.16 xx 10^(14) Hz. Then its work-function is _____ eV.

KUMAR PRAKASHAN-DUAL NATURE OF RADIATION AND MATTER-Section-D (MCQs asked in AIIMS)
  1. alpha-particle and deuteron moves with speed v and 2v respectively .Wh...

    Text Solution

    |

  2. If linear momentum of a particle is 2.2xx10^(4) kgms^(-1) then what wi...

    Text Solution

    |

  3. In photoelectric effect threshold wavelength of sodium is 5000Å .Find ...

    Text Solution

    |

  4. Photoelectric effect represent that ………..

    Text Solution

    |

  5. Frequency of photon having 100 eV energy is ……Hz [h=6.62xx10^(-34)Js,1...

    Text Solution

    |

  6. An electron and proton move in same direction with equal kinetic energ...

    Text Solution

    |

  7. Work function of photosensitive surface is phi .When photon of 3phi en...

    Text Solution

    |

  8. If particle mentioned below moves with same velocity which will have h...

    Text Solution

    |

  9. Work function of metal is 1.6 eV for which maximum wavelength photoele...

    Text Solution

    |

  10. The K.E. of photoelecttron emitted from a metal are K(1) and K(2) ,whe...

    Text Solution

    |

  11. A particle of mass m kg and charge q coulomb is accelerated through V ...

    Text Solution

    |

  12. When a strong electric field of approximately ……is applied on the meta...

    Text Solution

    |

  13. If kinetic energy of emitted electron is made double then its de-Brogl...

    Text Solution

    |

  14. Threshold wavelength for lithium metal is 6250 Å wavelength of inciden...

    Text Solution

    |

  15. Object of 100 g mass moves with velocity of 36 km/hr .de-Broglie wavel...

    Text Solution

    |

  16. The wavelength of de-Broglie wave associated with a neutron of mass m ...

    Text Solution

    |

  17. Photons of energy 1 eV and 2.5 eV sucesseively illuminate a metal,whos...

    Text Solution

    |

  18. To change de-Broglie wavelength from 0.5xx10^(10)m to 1xx10^(-10)m its...

    Text Solution

    |

  19. The threshold wavelength of Na element is 6800 Å.Its work function is ...

    Text Solution

    |

  20. In discharge tube with increase in number density of gas intensity of ...

    Text Solution

    |