A piece of copper and anotehr piece of silicon are cooled down to 80 k from room temperatrue then the resistance of

Options

A. copper decrease and silicon increases
B. copper increases and silicon decreases
C. both of them increases
D. both of them increases

Explanation

To solve the problem regarding the resistance of copper and silicon when cooled down to 80 K from room temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Materials**:
- Copper is a metal, and its resistance behavior is different from that of silicon, which is a semiconductor.
- Metals typically have a positive temperature coefficient of resistance, meaning their resistance increases with temperature.
- Semiconductors, on the other hand, have a negative temperature coefficient of resistance, meaning their resistance decreases with increasing temperature.
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