An electron of mass m and charge e is accelerating from rest through a potential difference v in vacuum it's final speed will be
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energy gained by electron when it passes through potential difference of V volt is eV now this energy will converted to kinetic energy and kinetic energy is equal to 1/2×mv^2
equating it with the the given energy
1/2×mv^2 = eV
v=(2eV/m)^2
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