The kinetic energy \( K \) of an electron moving at a speed \( v \) is given by:
\[ K = \frac{1}{2} m v^2 \]
where:
- \( m \) is the mass of the electron, \( 9.109 \times 10^{-31} \) kg
- \( v \) is the speed of the electron, \( 1.4 \times 10^6 \)
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