Question:
The crystal system with edge lengths \( a \ne b \ne c \) and axial angles \( \alpha = \beta = \gamma = 90^\circ \) is 'x' and number of Bravais lattices for it is 'y'. x and y are
The crystal system with edge lengths \( a \ne b \ne c \) and axial angles \( \alpha = \beta = \gamma = 90^\circ \) is 'x' and number of Bravais lattices for it is 'y'. x and y are
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Orthorhombic system: \( a \ne b \ne c \) and \( \alpha = \beta = \gamma = 90^\circ \). It has the second-highest number of Bravais lattices (4), after the cubic system (3).
Updated On: Jan 3, 2026
- Cubic ; 3
- Monoclinic ; 2
- Orthorhombic ; 4
- Trigonal ; 2
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The Correct Option is C
Solution and Explanation
Step 1: Identify the crystal system
Given:
- Edge lengths: \( a \ne b \ne c \)
- Angles: \( \alpha = \beta = \gamma = 90^\circ \)
This matches the Orthorhombic crystal system, where all edges are unequal but all angles are 90°.
Step 2: Count the number of Bravais lattices
The orthorhombic system has 4 types of Bravais lattices:
- Simple (P)
- Body-centered (I)
- Base-centered (C)
- Face-centered (F)
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