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**Electron concentration in n-type semiconductor**

**1. Homework Statement**

**At T = 0 K, what is the electron concentration in a Si semiconductor that is doped with Phosphorus atoms at ND=1017 cm^-3? At room temperature, what is the electron concentration of this semiconductor?**The electron mobility of Si is 1350 cm2/Vs, calculate the resistivity of this semiconductor.

Just the bolded part. I'm not sure if the information in the second sentence is relevant to the first part.

**2. Homework Equations**

In the course notes I'm given dozens of equations, but I don't see how any of them would be useful for this question.

**3. The Attempt at a Solution**

I'm totally clueless, don't even know where to begin.

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