hi when we do measurement on wavefunction it collapses and it
gives one of its eigen value depending upon its probability.. when we do
measurement again(very soon after the first measurement) in the same
wavefunction quantum mechanics says that it will give the same eigen
value just what it gave the prior measurment.. after that once again the
wavefunction(superpostion of all eigen functions) evolve according to
schrodinger equation with time.. when we do measurement the wavefunction
take up one of its eigen function. up to howlong(time period) it will
in that eigen state? and when the collapsed wavefuntion comeback to
general wavefuntion?