# Crystal frames problem, what actually asking?

#### frostysh

1. Homework Statement

The problem from Sterway, Jewett book.

3. The Attempt at a Solution

The answer in the book is something like 0,141 nm, as I remembered but I cannot achieve such answer coz' I cannot understand what actually asking, d is looks like a distance between two centers of the atomic spheres, but I don't think that it can be 0,141 nm, probably due to my English language, so can somebody clarify for little bit, what the hell I need to find in this problem. I am stucked for now, and my brain will start to melt soon. And imho - this book have too much of unnecessary problem, 70 problem for the first chapter is too much... Thanx.

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#### BvU

Homework Helper
In the same way as the distance between vertical or horizontal planes is L, the distance between the 45 degree planes is ${1\over 2}\sqrt 2$ L. Easiest seen in a side view:

#### frostysh

In the same way as the distance between vertical or horizontal planes is L, the distance between the 45 degree planes is ${1\over 2}\sqrt 2$ L. Easiest seen in a side view:
View attachment 198771
Or this picture in the book is distracting, or frostysh is just too dull :), anyway I have solved the problem on my new cool self-made school-board, and now I am very happy ^^. Thanx again, Solved.

"Crystal frames problem, what actually asking?"

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