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physics

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if electron are caused to fall through a potential difference of 100000 voltage , determine their final speed if they were initially at rest.

  • physics - ,

    e*100,000 is the kinetic energy.
    e is the electron charge,1.6*10^-19 C

    Set 100,000*e equal to (1/2)mV^2 and solve for V

    m is the electron mass.

  • physics - ,

    6646

  • physics - ,

    p.d.=100000V
    therefore, workdone , W=q×p.d.
    W=1.6×10^-19 × 100000
    =1.6×10^-14 Joules
    since work done = force × displacement
    F×s=1.6×10^-14
    m×a×s=1.6×10^-14
    9.1×10^-31×a×s=1.6×10^-14
    a×s=(1.6×10^-14)÷(9.1×10^-31)
    a×s=1.75×10^17
    v^2/2=1.75×10^17
    v=5.09×10^8m/s

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