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

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

  1. A

    9.3 × 10-2 nm

  2. B

    18.96 × 10-2 nm

  3. C

    27.9 × 10-2 nm

  4. D

    3.3 × 10-2 nm

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    Solution:

    Distance of CM from m1 is

    m2dm1+m2=80 x 0.282 x 10-939+80

    = 0.1896 x 10-9 m = 18.96 x 10-2 nm

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