Question

A long time ago, in a galaxy far, far away, electric charge had not yet been...

A long time ago, in a galaxy far, far away, electric charge had not yet been invented, and atoms were held together by gravitational forces. Compute the Bohr radius (a0) and the

n = 5 to n = 4

transition energy

(E5E4)

in a gravitationally bound hydrogen atom.

a0

= m

E5E4

= eV

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