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This is the gravitational radius of an electron:

r_e = 2GM_d/(c²r)

where

G is Newton's gravitational constant,

M_d is the mass of the central body = 10⁻¹⁸ kg,

c is the speed of light, and

r is the Bohr radius.

This gives a value

r_e = 10 ⁻¹⁵ m

Units of length Atomic physics

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Topics: Gravitational Radius Of An Electron, Gravitational Redshift...

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