Home
Class 12
PHYSICS
Threshold wavelength of metal is 30 Å If...

Threshold wavelength of metal is 30 Å If radiation of 2000Å Is incident metal surface then ……

A

positron will be emitted.

B

proton will be emitted.

C

electron will be emitted

D

electron will not be emitted.

Text Solution

Verified by Experts

The correct Answer is:
D
Here,radiation (light) of wavelength larger than threshold wavelength is emitted hence photo electron will not be emitted.
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (multiple choice questions (MCQs) (photo-electric effect)|1 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-D (multiple choice questions (MCQs) (Photon)|28 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    KUMAR PRAKASHAN|Exercise Section-C (Long answer Type Question)|5 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
KUMAR PRAKASHAN-DUAL NATURE OF RADIATION AND MATTER-Section-D (multiple choice questions (MCQs)
  1. When a piece of sodium or potassium are exposed to sunlight ……..

    Text Solution

    |

  2. If photo-electric effect is not seen with the ultraviolet radiation in...

    Text Solution

    |

  3. Threshold wavelength of metal is 30 Å If radiation of 2000Å Is inciden...

    Text Solution

    |

  4. Work function of metal A,B and C are 4.5 eV 4.3 eV and 3.8eV respectiv...

    Text Solution

    |

  5. What will be maximum value of wavelength by which photo-electric emiss...

    Text Solution

    |

  6. A metal surace objects electrons when hit by green light but none when...

    Text Solution

    |

  7. Photo-electric emission is observed from a metalli surface for frequen...

    Text Solution

    |

  8. If photo-electric effect,when frequency of incident radiation is doubl...

    Text Solution

    |

  9. For metals cesium ,potassium ,sodium and lithium graph of stopping pot...

    Text Solution

    |

  10. Maximum kinetic energy of photoelectron emitted is independent of ……

    Text Solution

    |

  11. In two different experiment X-rays are incident on sodium metal and th...

    Text Solution

    |

  12. Ultraviolet radiation in incident on sodium metal.Then visible light i...

    Text Solution

    |

  13. When monochromatic source is kept at distance of 0.2 m from photocell,...

    Text Solution

    |

  14. Maximum speed of electron emitted from metal surface is 5xx10^(6 )ms^(...

    Text Solution

    |

  15. The work function of a metal surface is 4.2 eV. The maximum wavelength...

    Text Solution

    |

  16. Threshold frequency for metal surface is 4xx10^(14) Hz.When radiation ...

    Text Solution

    |

  17. On metal surface radiation of 2000Å and 5000 Å is incident sequentiall...

    Text Solution

    |

  18. Slope of V(0)toV graph shows…..

    Text Solution

    |

  19. Slope of V(0)etoV represent……

    Text Solution

    |

  20. ……potentail on collector w.r.t. emitter for which photo-electric curre...

    Text Solution

    |