Diamond exists in FCC unit cell with 50% tetrahedral sites also occupied. The effective number of carbon atoms in a unit cell of diamond is

Explanation

To determine the effective number of carbon atoms in a unit cell of diamond, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Diamond**:
- Diamond crystallizes in a face-centered cubic (FCC) structure.

2. **Calculate the Number of Atoms in the FCC Unit Cell**:
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