Find the ground state energy using the variational principle for the given hamiltonian h--" -78(y). use the trial wave function (y)= de ** with a as the variational parameter. (hint: 1 x*e***dx=(24) **2 r(m+; )] two identical particles p and 9 of rest mass m., are moving with velocities and in directions x and -x respectively in the lab frame. calculate the energy of particle p in o's rest frame. (b) .c? (c) me? evaluate (ax)(ap) for a particle having wavefunction w= 101 the structure of potassium chloride is formed by touching the spheres of potassium and chloride with each other. the radius of the potassium atom is d, and radius of chlorine atom is d. both the spheres touch each other to form a simple cubic lattice structure. the packing fraction for this structure is, (a) d'+d, (d,+d) (b) +(4+d) 2(d,+d.) (0 =[land learn ] ( 2. d' + d 3 (d. + d.)