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JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    In which of the following unit cells all sides and all angles are equal?  Cubic (I), Tetragonal (II), Orthorhombic (III), Rhombohedral (IV)

    A)  I and II                

    B)  I                 

    C)  I and III               

    D)  I and IV

    Correct Answer: D

    Solution :

     Cubic \[\frac{D'}{D}=\frac{V}{V-\Delta V}={{\left[ 1-\frac{\Delta V}{V} \right]}^{-1}}=1+\frac{\Delta V}{V}\] and \[\frac{D'}{D}-1=\frac{\Delta V}{V}\]) and Rhombohedral \[\frac{D'-D}{D}=\frac{\Delta V}{V}\] and \[\frac{\Delta V}{V}=\frac{p}{B}\] have all sides and all angles equal.


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