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    a stationary nuclei decays to proton and electron. explain why principle of conservation of momemtum tells u dat almost all this Kinetic energy is given to the electron?
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    (Original post by vp03)
    a stationary nuclei decays to proton and electron. explain why principle of conservation of momemtum tells u dat almost all this Kinetic energy is given to the electron?
    The principle of conservation of momentum says momentum after = momentum before. Since the momentum before the decay was 0, the momenta of the proton and electron must be of equal magnitude, but in opposite directions. The mass of the proton is a lot greater than that of an electron, so it must have a much smaller velocity (and therefore less KE).
 
 
 
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