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प्रश्न
The number of atoms contained in one face-centred cubic unit cell of a monoatomic substance is ______.
पर्याय
1
2
4
3
MCQ
रिकाम्या जागा भरा
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उत्तर
The number of atoms contained in one face-centred cubic unit cell of a monoatomic substance is 4.
Explanation:
In a face-centred cubic (fcc) unit cell, atoms are present at 8 corners and 6 face centres. Each corner atom contributes `1/8` and each face atom contributes `1/2`, so
Total number of atoms = `8 xx 1/8 + 6 xx 1/2`
= 1 + 3
= 4 atoms
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