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Question

The Miller indices of the crystal plane which cut through the crystal axes at (2a, -3b, -3c) is :

The correct answer is

($ 2  \bar{2}  \bar{2}$)

To find the Miller indices of a crystal plane that intersects the crystal axes at given points, follow these steps:

  1. Given intercepts on the axes are: \(2a, -3b, -3c\).
  2. Express these intercepts in terms of the crystallographic axes: \( (h, k, l) \) where \( h, k, \) and \( l \) are the reciprocals of the intercepts, avoiding fractions.
  3. Calculate the reciprocals of these intercepts:
    • \(x = \frac{1}{2a} \to \frac{1}{2}\)
    • \(y = \frac{1}{-3b} \to -\frac{1}{3}\)
    • \(z = \frac{1}{-3c} \to -\frac{1}{3}\)
  4. Clear these fractions by multiplying through by the smallest common denominator, which is 6:
    • \(6 \times \frac{1}{2} = 3\)
    • \(6 \times \left(-\frac{1}{3}\right) = -2\)
    • \(6 \times \left(-\frac{1}{3}\right) = -2\)
  5. The Miller indices are therefore represented as \((3, -2, -2)\), which is equivalent to the option \((2, \bar{2}, \bar{2})\).

The \( \bar{\ } \) symbol denotes the negative of the index in Miller indices notation.

Therefore, the correct answer is \((2, \bar{2}, \bar{2})\).

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Important Questions from Solid State

  1. The packing efficiency (in %) of spheres for a body-centered cubic (bcc) lattice is approximately

  2. In NaCl crystal, the radius ratio is :

  3. Minimum interplanar spacing required for Bragg’s diffraction is:

  4. What does 'θ' represent in Bragg's Law?

  5. Which of the following is molecular solid?

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