Q10M.3 Imagine that the proton and electron in a hydrogen atom were not charged. They could still form an atom based on the gravitational (instead of electrostatic) attraction between the two quantons. What would be (a) the minimum orbital radius and (b) the minimum energy of the electron in this gravitational atom? Answer E₁ = 4 x 10-⁹7 J.

Q10M.3 Imagine that the proton and electron in a hydrogen atom were not charged. They could still form an atom based on the gravitational (instead of electrostatic) attraction between the two quantons. What would be (a) the minimum orbital radius and (b) the minimum energy of the electron in this gravitational atom? Answer E₁ = 4 x 10-⁹7 J.