If the photon had a nonzero mass (mγ ≠ 0), the Coulomb potential would be replaced by the...

If the photon had a nonzero mass (mγ ≠ 0), the Coulomb potential would be replaced by the Yukawa potential,

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Where µ = mγc/h. With a trial wave function of your own devising, estimate the binding energy of a "hydrogen" atom with this potential. Assume µa ≪ 1, and give your answer correct to order (µa)2.