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If the distance between the centres of the atoms of potassium and bromine in KBr molecule is 0.282 × 10-9 m, the distance of centre of mass of this two particle system from potassium is (mass of bromine = 80 u and of potassium = 39 u).

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a

9.3 × 10-2 nm

b

18.96 × 10-2 nm

c

27.9 × 10-2 nm

d

3.3 × 10-2 nm

answer is B.

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If the distance between the centres of the atoms of potassium and bromine in KBr molecule is 0.282 × 10-9 m, the distance of centre of mass of this two particle system from potassium is (mass of bromine = 80 u and of potassium = 39 u).