Home
Class 12
PHYSICS
What is the (a) momentum (b) speed and (...

What is the (a) momentum (b) speed and (c) de-Broglie wavelength of an electron with kinetic energy of 120 eV. Given `h=6.6xx10^(-34)Js, m_(e)=9xx10^(-31)kg , 1eV=1.6xx10^(-19)J`.

A

725 pm

B

500 pm

C

322 pm

D

112 pm

Text Solution

Verified by Experts

The correct Answer is:
D
For a particle , de Broglie wavelength `lamda = h/p`
Kinetic energy , `K = p^2/(2m) :. Lamda =(h)/(sqrt(2mK))`
For and electron `lamda=h/(sqrt(2m_eK_e))`
`=((6.63 xx10^(-34)Js))/(sqrt(2xx(9.11 xx10^(-31)kg)xx(120 xx 1.6 xx10^(-19)J)))`
`= 112 xx 10^(-12) m = 112 "pm " [ :. 1 " pm" = 10^(-12)m]`
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF MATTER AND RADIATION

    MTG GUIDE|Exercise NEET Cafe Topicwise Practice Questions (DAVISSON AND GERMER EXPERIMENT)|2 Videos

  • DUAL NATURE OF MATTER AND RADIATION

    MTG GUIDE|Exercise CHECK YOUR NEET VITALS|27 Videos

  • DUAL NATURE OF MATTER AND RADIATION

    MTG GUIDE|Exercise NEET Cafe Topicwise Practice Questions (PARTICLE NATURE OF LIGHT (THE PHOTON)|17 Videos

  • CURRENT ELECTRICITY

    MTG GUIDE|Exercise MCQs AIPMT / NEET|32 Videos

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MTG GUIDE|Exercise AIPMT/NEET MCQS|31 Videos

Similar Questions

Explore conceptually related problems

The de Broglie wavelength of an electron with kinetic energy 120 e V is ("Given h"=6.63xx10^(-34)Js,m_(e)=9xx10^(-31)kg,1e V=1.6xx10^(-19)J)

if the de broglie wavelength of an electron is 0.3 nanometre, what is its kinetic energy ? [h=6.6xx10^(-34) Js, m=9xx10^(-31)kg, 1eV = 1.6xx10^(-19) J]

If de Broglie wavelength of an electron is 0.5467 Å, find the kinetic energy of electron in eV. Given h=6.6xx10^(-34) Js , e= 1.6xx10^(-19) C, m_e=9.11xx10^(-31) kg.

Calculate the (a) momentum and (b) de-Broglie wavelength of the electrons accelerated through a potential difference of 56V. Given, h=6.63xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg, e=1.6xx10^(-19)C .

Calculate the de-Broglie wavelength of an electron of kinetic energy 100 eV. Given m_(e)=9.1xx10^(-31)kg, h=6.62xx10^(-34)Js .

Calculate the energy of an electron having de-Broglie wavelength 5500Å. Given, h=6.62xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg .

Calculate the speed of the electron in the first Bohr orbit given that h=6.6xx10^(-34) Js, m=9.11xx10^(-31) kg and e=1.603xx10^(-19) C .

de-Brogile wavelength of an electron accelerated by a voltage of 50 V is close to ( |e| = 1.6 xx 10^(-19)C, m_(e) = 9.1 xx 10^(-31) kg, h = 6.6 xx 10^(-34) Js) :-

The de-Broglie wavelength of an electron is 66 nm. The velocity of the electron is [h= 6.6 xx 10^(-34) kg m^(2)s^(-1), m=9.0 xx 10^(-31) kg]

De - Broglie wavelength of an electron accelerated by a voltage of 50 V is close to (|e|=1.6xx10^(-19)C,m_(e)=9.1xx10^(-31))

MTG GUIDE-DUAL NATURE OF MATTER AND RADIATION -NEET Cafe Topicwise Practice Questions (MATTER WAVES AND DE BROGLIE RELATION)
  1. lambda(e),lambda(p) and lambda(alpha) are the de-Broglie wavelength of...

    Text Solution

    |

  2. The wavelength of the matter wave is independent of

    Text Solution

    |

  3. A praticle of mass M at rest decays into two particle of masses m1 and...

    Text Solution

    |

  4. If the kinetic energy of a particle is increased by 10 times, the perc...

    Text Solution

    |

  5. If m is the mass of an electron and c the speed of light, the ratio of...

    Text Solution

    |

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

    Text Solution

    |

  7. The ratio of the de-Broglie wavelengths of an electron of energy 10 eV...

    Text Solution

    |

  8. The de Broglie wavelength is given by

    Text Solution

    |

  9. The linear momentum of an electron, initially at rest, accelerated thr...

    Text Solution

    |

  10. The de - Broglie wavelength of a ball of mass 120 g moving at a speed ...

    Text Solution

    |

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

    Text Solution

    |

  12. If the kinetic energy of a moving particle is E , then the de-Broglie ...

    Text Solution

    |

  13. The de Broglie wavelength lamda of an electron accelerated through a p...

    Text Solution

    |

  14. An electron, an alpha-particle, and a photon have the same kinetic ene...

    Text Solution

    |

  15. The energy that should be added to an electron to reduce its de - Brog...

    Text Solution

    |

  16. If alpha particle, proton and electron move with the same momentum, th...

    Text Solution

    |

  17. The de Broglie wavelength and kinetic energy of a particle is 2000 Å a...

    Text Solution

    |

  18. Consider the four gases hydrogen, oxygen, nitrogen and helium at the s...

    Text Solution

    |

  19. What is the (a) momentum (b) speed and (c) de-Broglie wavelength of an...

    Text Solution

    |

  20. If the mass of a microscopic particle as well as its speed are halved,...

    Text Solution

    |