Answer :

Given: Mass of the earth = me = 6.0 × 1024 kg


Mass of the sun = ms = 2.0 × 1030 kg


earth-sun distance = r =1.5 × 1011 m


Applying Bohr’s quantization rule for angular momentum



And due to gravitational force balancing centripetal force.



Using both the equations we get



And


(a) For minimum value of r, n=1



(b) For present radius



After substituting the values as above



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