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Mechanical Properties Of Fluids

Question
CBSEENPH11020733
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Sodium has body centred packing.Distance between two nearest atoms is 3.7 A. The lattice parameter is

  • 6.8 A

  • 4.3 A

  • 3.0 A

  • 8.6 A

Solution

B.

4.3 A

The neighbour distance of a body centred cubic cell,straight d space equals space fraction numerator square root of 3 straight a end root over denominator 2 end fraction where a is the lattice parameter.

3.7 space equals space square root of fraction numerator 3 straight a over denominator 2 end fraction end root straight a space equals space fraction numerator 2 space straight x space 3.7 over denominator square root of 3 end fraction space equals space 4.3 space straight A

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