An electron has kinetic energy of 0.1 Mev.Find its speed according to classical and relativistic mechanics
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The electron starts from rest (near enough) so the kinetic energy gained is given by ½mv 2 where m is its mass and v is its speed. For an electron gun with a voltage between its cathode and anode of V = 100V the electron will have a speed of about v = 6 × 10 6 m/s.
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