Starting with the standard particle in a box Hamiltonian as the zero ${ }^{\text {th }}$ order Hamiltonian and the potential of $\mathrm{V}_{1}$ from 'a/2' to 'a' as a perturbation, the first order energy state is
(a)$\mathrm{V}_{1}$
(b)$\mathrm{V}_{1} / 4$
(c)$-\mathrm{V}_{1}$
(d)$\mathrm{V}_{1} / 2$
Answer
SELF-PRACTICE — the source book printed no answer.
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