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assuming charge on Proton as q and mass as m, above is the equation based on conservation of energy (decrease in potential energy is equal to increase in kinetic energy here)
therefore, uproton = √(2qV/m)
As α particle has 2 protons and 2 neutrons, so charge = 2q and mass = 4m and the equation becomes
2qV = 1/2 * 4m * u2
So, uα = √(qV/m)
Therefore, uα = uproton / √2
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