The temperature dependence of resistances of \(\mathrm{Cu}\) and undoped \(\mathrm{Si}\) in the temperature range \(300\text-400~\text{K}\), is best described by:
1. | Linear increase for \(\mathrm{Cu}\), linear increase for \(\mathrm{Si}\) |
2. | Linear increase for \(\mathrm{Cu}\), exponential increase for \(\mathrm{Si}\) |
3. | Linear increase for \(\mathrm{Cu}\), exponential decrease for \(\mathrm{Si}\) |
4. | Linear decrease for \(\mathrm{Cu}\), linear decrease for \(\mathrm{Si}\) |