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JEE Main & Advanced Sample Paper JEE Main Sample Paper-39

  • question_answer
    An 'fcc' in a unit cell of aluminium contains the equivalent of how many atoms?

    A)  1                                

    B)  2

    C)  3                                

    D)  4

    Correct Answer: D

    Solution :

     In a 'fcc' crystal atoms are located at the centre of the 6 faces and at the 8 comers. On each face their is 1 atom which is shared by 2 cells. Hence, the no. of atoms/ unit cell = 6/2 = 3 Again the comer atom is shared by 8 other cells. Hence no. of atoms = 8/8 = 1 No. of atoms/unit cell = 1 + 3 = 4


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