Home
Class 12
PHYSICS
If the K.E. of free electron doubles, it...

If the K.E. of free electron doubles, its de-Broglie wavelength changes by the factor

A

`(1)/(2)`

B

2

C

`(1)/(sqrt(2))`

D

`sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda = (h)/(sqrt(2mK))`
When kinetic energy is doubled, `lambda. = (h)/(sqrt(2m xx 2K)) = (1)/(sqrt(2)) lambda`
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise ADDITIONAL QUESTIONS -(SHORT ANSWER QUESTIONS )|7 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise ADDITIONAL QUESTIONS -( LONG ANSWER QUESTIONS )|7 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise TEXTUAL EVALUATION SOLVED -( NUMERICAL PROBLEMS)|15 Videos

  • CURRENT ELECTRICITY

    FULL MARKS|Exercise Additional Questions Solved (Numerical Problems)|6 Videos

  • ELECTROSTATICS

    FULL MARKS|Exercise ADDITIONAL QUESTIONS SOLVED ( VII. NUMERICAL PROBLEMS )|5 Videos

Similar Questions

Explore conceptually related problems

If a proton and electron have the same de-Broglie wavelength, then

If the momentum of a particle is doubled, then its de-Broglie wavelength will

What is de-Broglie wavelength of electron having energy 10 KeV ?

Derive an expression for De Broglie wavelength.

Find the kinetic energy of an electron in ( eV) if the de-Broglie wavelength of the radiation produced is 112 Å

If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change ?

Can a proton and an electron have the same de Broglie wavelength?

A proton and an electron have same de Broglie wavelength. Which of them moves faster and which possesses more kinetic energy ?

FULL MARKS-DUAL NATURE OF RADIATION AND MATTER-ADDITIONAL QUESTIONS -(MULTIPLE CHOICE QUESTIONS )
  1. 4 eV is the energy of the incident photon and the work function is 2 e...

    Text Solution

    |

  2. A light having wavelength 300 nm falls on a metal surface work functio...

    Text Solution

    |

  3. If the K.E. of free electron doubles, its de-Broglie wavelength change...

    Text Solution

    |

  4. If the kinetic energy of a particle is increased by 16 times, the perc...

    Text Solution

    |

  5. When a proton is accelerated through 1V, then its kinetic energy will ...

    Text Solution

    |

  6. The kinetic energy of an electron, which is accelerated in the potenti...

    Text Solution

    |

  7. Kinetic energy of emitted electron depends upon

    Text Solution

    |

  8. The work function of photometal is 6.626 eV. What is the threshold wav...

    Text Solution

    |

  9. The number of photo-electrons emitted for light of a frequency upsilon...

    Text Solution

    |

  10. The speed of an electron having a wavelength of 10^(-10) m is

    Text Solution

    |

  11. If an electron and a photon propagate in the form of waves having the ...

    Text Solution

    |

  12. Electron volt (eV) is a unit of

    Text Solution

    |

  13. Photon of frequency v has a momentum associated with it. If c is the v...

    Text Solution

    |

  14. The time taken by a photoelectron to come out after photon strikes is ...

    Text Solution

    |

  15. Cathode rays consist of

    Text Solution

    |

  16. The momentum of photon whose frequency is f is

    Text Solution

    |

  17. The energy of photon of wavelength lambda is

    Text Solution

    |

  18. The ratio of the energy of a photon with lambda = 150 nm to that with ...

    Text Solution

    |

  19. Photons of 5.5 eV energy fall on the surface of the metal emitting pho...

    Text Solution

    |

  20. The wavelength of photon is proportional to (where upsilon = fequency)

    Text Solution

    |