Kittel 8.1: Calculate Donor Ionization Energy

[ehrenfest]

Homework Statement

This question refers to Kittel's Solid-state physics book.

I think it is obvious that we should use equations (51) and (52) here but I am very confused about this problem because Kittel never says what the impurity is and what the impurity is in.
Can someone fill in the blanks:
(a) Calculate the donor ionization energy of _____ in _______ .

Homework Equations

The Attempt at a Solution

 

[Dick]

Which problem? What are you talking about?

 

[ehrenfest]

Which problem? What are you talking about?

This question refers to problem 8.1 in Kittel's Solid-state physics book.