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The gravitational force between an H-atom

Question:

The gravitational force between an H-atom and another particle of mass m will be given by Newton’s law: F = G M.m/r2 , where r is in km and

(a) M = mproton + m electron

(b) M = mproton + melectron – B/c2 (B = 13.6 eV)

(c) M is not related to the mass of the hydrogen atom

(d) M = mproton + m electron |V |/c2 – (|V | = magnitude of the potential energy of electron in the H-atom)

Solution:

(b) M = mproton + melectron – B/c2 (B = 13.6 eV)

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