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Crystal frames problem, what actually asking?

  1. May 5, 2017 #1
    1. The problem statement, all variables and given/known data

    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.
  2. jcsd
  3. May 5, 2017 #2


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    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:
  4. May 6, 2017 #3
    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.
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