question_answer 33)

  The gravitational force between a H-atom and another particle of mass m will be given by Newton's law:   where r  is in km and (a)                 (b) (c) M is not related to the mass of the hydrogen atom (d) magnitude of the potential energy of electron in the H-atom)

Answer:

                                                                         (b)In the relation . M=effective mass of hydrogen atom = mass of proton + mass of electron - B/c2; where B is B.E. of hydrogen atom =13.6. Choice (b) is correct