Home
Class 12
PHYSICS
For given metal work function is W(0) an...

For given metal work function is `W_(0)` and threshold wavelength is `lambda_(0)`.If metal has work function `(W_(0))/(2)` then what will be threshold wavelength ?

A

`(lambda_(0))/(4)`

B

`(lambda_(0))/(2)`

C

`2lambda_(0)`

D

`4lambda_(0)`

Text Solution

Verified by Experts

The correct Answer is:
C
`W_(0)=(hc)/(lambda_(0))` and `W_(0)=(hc)/(lambda_(0))`
`therefore (W_(0))/(W_(0))=(lambda_(0))/(lambda_(0))`
`(W_(0))/(W_(0))=(lambda_(0))/(lambda_(0))`
`(W_(0))/((W_(0))//(2))=(lambda_(0))/(lambda_(0)) [because W_(0)=(W_(0))/(2)]`
`therefore 2lambda_(0)=lambda_(0)`
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

Photoelectric effect takes place in element A. Its work function is 2.5 eV and threshold wavelength is lambda . An other element B is having work function of 5 eV . Then find out the wavelength that can produce photoelectric effect in B.

Define work function of metal and write its unit.

When a metallic surface is illuminated by a monochromatic light of lamda the stopping potential for photoelectric current is 4V_(0) when the same surface is illuminated by light of wavelength 3 lamda the stopping potential is V_(0) The threshold wavelength for this surface for photoelectric effect is -

A certain metallic surface is illuminated with monochromatic light of wavelength lambda .The stopping potentail for photelectric current for this light is 3V_(0) .If the same surface is illuminated with light of wavelength 2lambda ,the stopping potential is V_(0) .The threshold wavelength for this surface for photoelectric effect is

The graph between 1/lambda and stopping potential V_(0) of two metals having work funcation phi_(1) and phi_(2) in an experiment of photoelectric effect is obtained as shown in the figure. Find out - (i) Threshold wavelength of both metals (ii) phi_(1) : phi_(2) (iii) Which metal can emit photoelectrons with visible light ?

If ratio of threshold frequencies of two metals is 1:3 ,ratio of their work function is ……

The stopping potential for the photo-electrons emitted from a metal surface of work-function 1.7 eV is 10.4 eV. Find the wavelength of the radiation used. Also identify the energy-levels in hydrogen atom which will emit this wavelength.

The work functions of tungsten and sodium are 5.06 eV and 2.53 eV respectively. If the threshold wavelenth for sodium is 5896 Å , then the threshold wavelength for the tungsten will be

When light of wavelength lambda is incident on a metal surface, stopping potential is found to be x. When light of wavelength nlambda is incident on the same metal surface, stopping potential is found to be (x)/(n+1) . Find the threshold wavelength of the metal.

KUMAR PRAKASHAN-DUAL NATURE OF RADIATION AND MATTER-Section-D (MCQs asked in AIIMS)
  1. A proton accelerated by potential difference 100 V have de-Broglie wav...

    Text Solution

    |

  2. When monochromatic light of frequency f(1) incident on photosensitive ...

    Text Solution

    |

  3. For given metal work function is W(0) and threshold wavelength is lamb...

    Text Solution

    |

  4. When point source is kept at 20 cm distance from photcell ,stopping vo...

    Text Solution

    |

  5. Wavelength of matter particle is independent of which of the quantitie...

    Text Solution

    |

  6. No .of photon emitted eery second from 60 W bulb will be ………

    Text Solution

    |

  7. A photon having 8 eV energy is incident on metal suraface with thresho...

    Text Solution

    |

  8. Ultraviolet light of 200 nm wavelength is incident on polished surface...

    Text Solution

    |

  9. alpha-particle and deuteron moves with speed v and 2v respectively .Wh...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  12. Photoelectric effect represent that ………..

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |