Home
Class 12
PHYSICS
Assertion : Kinetic energy of photo elec...

Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon.
Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
D
According to Einstein’s equation `KE = hn - hn_0` , i.e., KE depends upon the frequency. Photoelectrons are emitted only if incident frequency is more than threshold frequency.
Promotional Banner

Topper's Solved these Questions

  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY

    ERRORLESS|Exercise PAST YEARS QUESTIONS|71 Videos

  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise ASSERTION & REASON|20 Videos

  • ELECTRONICS

    ERRORLESS|Exercise Assertion & Reason|26 Videos

Similar Questions

Explore conceptually related problems

Assertion (A) : Kinetic energy of photoelectrons emitted by a photosensitive surface depends upon the frequency of incident photon. Reason (R ): The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

The kinetic energy of photoelectrons emitted by a photosensitive surface depends on the internsity of the incident radiation

The photo electrons emitted from the surface of sodium metal are

Assertion : The number of electrons ejected from a metal surface depend upon the frequency of light. Reason : There is a time lag between the striking of light beam and the ejection of electrons from the metal surface.

The photo-electrons emitted from a surface of sodium metal are such that

Kinetic energy of photo electrons is independent on........of incident radiation.

ERRORLESS-ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY-ASSERTION & REASON
  1. Assertion : X - rays travel with the speed of light. Reason : X- ray...

    Text Solution

    |

  2. Asseration : Mass of moving photon varies inversely as the wavelength...

    Text Solution

    |

  3. Assertion : Kinetic energy of photo electrons emitted by a photosensit...

    Text Solution

    |

  4. Assertion : Separation of isotope is possible because of the differenc...

    Text Solution

    |

  5. Assertion : The specific charge of positive rays is not constant. Re...

    Text Solution

    |

  6. Assertion : Photosensitivity of a metal is high if its work function i...

    Text Solution

    |

  7. Assertion : The de - Broglie wavelength of a molecule varies inversely...

    Text Solution

    |

  8. Assertion : An electron is not deflected on passing through certain re...

    Text Solution

    |

  9. Assertion : Electric conduction in gases is possible at normal pressur...

    Text Solution

    |

  10. Assertion : Light is produced in gases in the process of electric disc...

    Text Solution

    |

  11. Assertion : The photoelectrons produced by a monochromatic light beam ...

    Text Solution

    |

  12. Assertion : An electric field is preferred in comparison to magnetic f...

    Text Solution

    |

  13. Assertion : The specific charge for positive rays is a characteristic ...

    Text Solution

    |

  14. Assertion : In Millikan's experiment for the determination of charge o...

    Text Solution

    |

  15. Assertion : In the process of photoelectric emission , all the emitted...

    Text Solution

    |

  16. Assertion : In photoelctric effect , on increasing the intensity of li...

    Text Solution

    |

  17. Assertion : Standard optical diffraction gratings cannot be used for ...

    Text Solution

    |

  18. Assertion : The threshold frequency of photoelectric effect supports t...

    Text Solution

    |

  19. Assertion : In photoemissive cell inert gas is used. Reason : Inert ...

    Text Solution

    |

  20. Assertion : X - rays cannot be diffracted by means of grating . Reas...

    Text Solution

    |