Physics · Quantum Mechanics
The wave function of a quantum mechanical system with the Hamiltonian H is ψ = c1f1 + c2f2, where c1 and c2 are constants and f1, f2 are orthonormal basis functions. If H11 = H22 = 5 eV and H12 = H21 = 2 eV, where Hij = ⟨fi|H|fj⟩, the ground state energy (in eV) of the system obtained by the variation method is:
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