Home
Class 12
PHYSICS
An electron and a photon, each has a wav...

An electron and a photon, each has a wavelength of `1.2Å` What is the ratio of their energies ?

A

`1:10`

B

`1:10^(2)`

C

`1:10^(3)`

D

`1:10^(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`(E_(e))/(E_(ph))=((h^(2))/(2mlambda^(2)))/((hc)/(lambda))=(h)/(2m lambdac)=(1)/(100) :.lambda=(h)/(sqrt(2mE_(e)))`
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-II)|63 Videos

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-III)|9 Videos

  • ELECTROMAGNETIC WAVES

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS|4 Videos

  • ELECTROSTATICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS |39 Videos

Similar Questions

Explore conceptually related problems

An electron and a photon each have a wavelength of 1.00 nm. Find (i) their momentum (ii) the energy of the photon and (iii) K.E of electron

What is the value of 1 Å?

A photo has a wavelength of 5000 Å. Calculate its momentum.

If an electron and a proton have the same de - Broglie wavelength , then the kinetic energy of the electron is

(a) An X-ray tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Å . What is the maximum energy of a photon in the radiation? (b) From your answer to (a), guess what order of accelerating voltage (for electrons) is required in such a tube ?

What is the expression for the energy of a photon?

MODERN PUBLICATION-ELECTRONS & PHOTONS-RECENT COMPETITIVE QUESTIONS
  1. An electron and a photon, each has a wavelength of 1.2Å What is the ra...

    Text Solution

    |

  2. According to Einstein's photoelectric equation the graph of K.E. of th...

    Text Solution

    |

  3. An electron is moving in an orbit of a hydrogen atom from which there ...

    Text Solution

    |

  4. v(1) is the frequency of the series limit of Lyman series, v(2) is te ...

    Text Solution

    |

  5. The de-Broglie wavelength of the electron in the ground state of the h...

    Text Solution

    |

  6. The photoelectric threshold wavelength for silver in lambda(0).The ene...

    Text Solution

    |

  7. An electron of mass m(e) and a proton of mass m(p) are moving with the...

    Text Solution

    |

  8. Pick out the wrong statement.

    Text Solution

    |

  9. A proton and an alpha particle are accelerated through the same potent...

    Text Solution

    |

  10. In hydrogen atom , electron excites from ground state of higher energy...

    Text Solution

    |

  11. An alpha - particle and a proton moving with the same kinetic energy e...

    Text Solution

    |

  12. X- rays, gamma rays and microwaves travelling in vacuum have

    Text Solution

    |

  13. If n is the orbit number of the electron in a hydrogen atom , the corr...

    Text Solution

    |

  14. A charged particle with a velocity 2 xx 10^3 ms^-1 passes undeflected ...

    Text Solution

    |

  15. Maximum velocity of the photoelectron emitted by a metal is 1.8 xx 10^...

    Text Solution

    |

  16. lamda(1) and lamda(2) are used to illuminated the slits. beta(1) and b...

    Text Solution

    |

  17. What is the de Broglie wavelength of the electron accelerated through ...

    Text Solution

    |

  18. The maximum kinetic energy of emitted photoelectrons depends on

    Text Solution

    |

  19. Find the de-Broglie wavelength of an electron with kinetic energy of 1...

    Text Solution

    |

  20. Light of two different frequencies whose photons have energies 1 eV an...

    Text Solution

    |

  21. The best waves for emission of electrons from a surface :

    Text Solution

    |