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The mass of an electron is 1/1840 part o...

The mass of an electron is `1/1840` part of mass of a proton. When they are subjected to a uniform electric field, they start accelerating. If they start from rest and have the same De Broglie wavelength of 1 angstrom unit, then determine the ratio of their kinetic energies

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Knowledge Check

  • The ratio of the de-Broglie wavelength of alpha -particle and a proton of same kinetic energy

    A
    ` 1 : 2`
    B
    ` 1: 1`
    C
    ` 1 : sqrt2`
    D
    `4 : 1`

  • The mass of a proton is 1837 times that of an electron. An electron and a proton are projected into a uniform electric field in a direction at right angles to the direction of the field with same initial kinetic energy. Then

    A
    both the trajectories will be equally curved
    B
    the proton trajectory will be less curved than the electron trajectory
    C
    the electron trajectory will be less curved than the proton trajectroy
    D
    the relative curving of trajectories will be dependent on the value of the initial kinetic energy

  • A particle of mass m carrying charge q is kept are rest in a uniform electric field E and then released. The kinetic energy gained by the particle, when it moves through a distance y is

    A
    a)`1/2 qEy^2`
    B
    b)`qEy`
    C
    c)`qEy^2`
    D
    d)`qE^2y`

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