1. On the following diagram circle indicate the (620) spot (assume the x direction is horizontal to the film). This photographic film of this diffraction photo was located 56 mm from the crystal and the x-rays used were the Cu 154 pm x-rays. The scale of the photo is on the left side of the film. What are the a and b distance of this protein?

2. Problem 23.4

3. Problem 23.7