For orthorhombic system axial ratios are `a nebnec` and the axial angle are

Options

A. `alpha=beta=gammane90^(@)`
B. `alpha=beta=gamma=90^(@)`
C. `alpha=gamma=90^(@), betane 90^(@)`
D. `alpha ne beta ne gamma ne 90^(@)`

Explanation

To solve the question regarding the orthorhombic system's axial ratios and axial angles, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Axial Ratios**:
- In crystallography, the axial ratios refer to the lengths of the edges of the unit cell along the three axes, which are typically denoted as 'a', 'b', and 'c'.
- For the orthorhombic system, the relationship between these axes is defined as:
\[ a \neq b \neq c \]
- This means that the lengths of the edges along the x, y, and z axes are all different.

2. **Understanding Axial Angles**:
- The axial angles are the angles between the edges of the unit cell. They are denoted as alpha (α), beta (β), and gamma (γ).
- For the orthorhombic system, the axial angles are defined as:
\[ \alpha = \beta = \gamma = 90^\circ \]
- This indicates that all angles between the axes are right angles.

3. **Conclusion**:
- Therefore, for the orthorhombic system, we conclude that:
- The axial ratios are \( a \neq b \neq c \).
- The axial angles are \( \alpha = \beta = \gamma = 90^\circ \).

### Final Answer:
- **Axial Ratios**: \( a \neq b \neq c \)
- **Axial Angles**: \( \alpha = \beta = \gamma = 90^\circ \)

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