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  4. Edge length of a cube is 400 pm, its body diagonal would be

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Q. Edge length of a cube is 400 pm, its body diagonal would be

Jharkhand CECEJharkhand CECE 2009

Solution:

Length of body diagonal
$ =a\sqrt{3} $
where $ a= $ edge length $ =400\sqrt{3}=692.82\,pm\approx 693\,pm $