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The Hamiltonian operator for a hydrogen atom in an electric field of strength E is shown in the image. Use perturbation theory to calculate the first-order correction to the ground state energy of a hydrogen atom in an external electric field of strength E. Show full and complete procedure in a clear way. Do not skip any steps

Ĥ
ħ²
-V²
2me
-
e²
4περν
+ e&r cos 0

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Answer f & E ONLY.
PLS CONTINUE THE ANSWER AND ANSWER D, E AND F HANDWRITTEN THEN BOX THE FINAL ANSWERS
solve