Spin fermions of mass m and 4m are in a harmonic potential V (x)=kx² . Which 2 configuration of 4 such particles has the lowest value of the ground state energy? (a) 4 particles of mass m (b) 4 particles of mass 4m (c) 1 particle of mass m and 3 particles of mass 4m (d) 2 particles of mass m and 2 particles of mass 4m

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