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What fraction (n/N) of the lattice sites...

What fraction (n/N) of the lattice sites are vacant at 298 K for a crystal in which the energy required to make a defect is 1 eV.`(1 eV = 1.602 xx 10^(-19) J)`

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Verified by Experts

We have,
`n/N =e^(-(E_(0)/(kt))`
`ln n/N = -E_(v)/(kT)`
or `logn/N = -E_(v)/(2.303kT) = -(1.602 xx 10^(-19))/(2.303 xx (8.314//6.022 xx 10^(23)) xx 298)`
On solving, `n/N = 1.24 xx 10^(-17)`
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RC MUKHERJEE-SOLID AND LIQUID STATES -OBJECTIVE PROBLEMS
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  2. Which of the following is an amorphous solid?

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  3. Which of the following is not a property of crystalline substance

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  4. A crystal may have one or more planes of symmetry as well as one or mo...

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  5. The number of basic crystal systems is

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  6. The total number of elements of symmetry in a cubic crystal is

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  7. The number of Bravais lattices in a cubic crystal is:

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  8. In a sodium chloride crystal, each chloride ion is surrounded by:

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  9. The structure of CsCl crystal is:

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  10. The structure of NaCl crystal is:

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  11. The arrangement of Cl^(-) ions in CsCl structure is-

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  12. The number of atoms per unit cell in a face-centred cube is:

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  13. The coordination number of a body-centred atom in cubic structure is

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  14. Close packing is maximum in the crystal which is

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  15. In a body-centred cubic arrangement the ion A occupies the centre whil...

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  16. The number of atoms per unit cell in a simple cube, face - centred cub...

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  17. The radius of an ion in a body-centred cube of edge a is:

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  18. The volume occupied by an atom in a simple cubic unit cell is:

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  19. In a body centred cubic cell an atom at the body of centre is shared b...

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  20. In a face centred cubic cell, an atom at the face centre is shared by-

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  21. An atom at the corner of a simple cubic cell is shared by:

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