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    Finding the velocity of an electron accelerated

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    Question: For an accelerating voltage of 900 V calculate the time taken for an electron to reach the anode after being accelerated from rest (u=0) at the cathode of a CRT. Anode-cathode separation is 1cm.

    I am looking for the working's out for this problem and the answer.

    © BrainMass Inc. brainmass.com December 24, 2021, 5:24 pm ad1c9bdddf
    https://brainmass.com/physics/velocity/velocity-electron-accelerated-45759

    SOLUTION This solution is FREE courtesy of BrainMass!

    Let m = mass of an electron

    e = charge on an electron

    V = potential difference between cathode and anode of discharge tube

    v = velocity of the electron as it comes out of anode

    As the electron is accelerated from cathode to anode, its potential energy gets
    converted into kinetic energy.

    Thus

    P.E. of an electron at the cathode = Gain in its K.E. at the anode

    eV = (1/2) mv<sup>2</sup>

    from this,

    velocity = sqrt[2eV/m]

    = sqrt[2*1.6 *10^-19 *900/9.11 * 10^-31 kg ]

    = 1.7780 *10^7 m/s

    since the separation between the plates is only 1cm = 0.01 meter,

    the time of travel is given by

    time = distance/velocity = 0.01/1.7780 *10^7 = 5.6242 * 10^-10sec

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 5:24 pm ad1c9bdddf>
    https://brainmass.com/physics/velocity/velocity-electron-accelerated-45759

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