Home
Class 12
PHYSICS
If an electron moving with a speed of 2....

If an electron moving with a speed of `2.5xx10^(7)ms^(-1)` is deflected by an electric field of `1.6k(V)m^(-1)` perpendicular to its circular path, then `(e)/(m)` for the electron will be (given radius of circular path =2.3m):

A

`1.67xx10^(11)Ckg^(-1)`

B

`1.76xx10^(11)Ckg^(-1)`

C

`1.7xx10^(11)Ckg^(-1)`

D

`1.59xx10^(11)Ckg^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`eE=(mv^(2))/(r)`
`:.(e)/(m)=(v^(2))/(Er)=1*7xx10^(11)C Kg^(-1)`
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

A monoenergetic electron beam with electron speed of 5.20xx10^(6) ms^(-1) is subject to a magnetic field of 1.30xx10^(-4)T normal to the beam velocity. What is the radius of the circle traced by the beam? Given e//m = 1.76 xx 10^(11) kg^(-1) .

In a chamber, a uniform magnetic field of 6.5 G (1 G = 10^(-4) T) is maintained. An electron is shot into the field with a speed of 4.8 x× 10^6 m s^(-1) normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit. (e = 1.5 x× 10^(-19) C, m_e = 9.1x×10^(-31) kg)

A beam of alpha particles having specific charge 2.5 xx 10^7 C kg^-1 moves with a speed of 2 xx 10^5 m s^-1 in a magnetic field of 0.05 T. The radius of the circular path described by the alpha -particle is

An electron is moving in a circle of radius r in a uniform magnetic field B. Suddenly the field is reduced to B/2 . The radius of the circular path now becomes.

What is the radius of the path of an electron (mass 9 × 10-31 kg and charge 1.6 ×x 10^(–19) C) moving at a speed of 3 ×x10^7 m/s in a magnetic field of 6 x× 10^(-4) T perpendicular to it? What is its frequency? Calculate its energy in keV. (1eV = 1.6 xx 10^(-19) J)

Calculate the wavelength of an electron moving with a velocity of 2.5xx10^(-7) ms^(-1)h=6.626xx10^(-34)Js: mass of an electron= 9.11xx10^(-31) kg.

MODERN PUBLICATION-ELECTRONS & PHOTONS-RECENT COMPETITIVE QUESTIONS
  1. If an electron moving with a speed of 2.5xx10^(7)ms^(-1) is deflected ...

    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

    |