00:01
The high everyone in this problem the primative translation vector of hexagonal space are given by a1 is called to root 3, ay2 x unit vector plus ay2, y unit vector.
00:59
A2 is equal to root 3, ay2, y unit vector.
01:00
A2 is equal to root 3, ay2, x unit vector plus ay2, y unit vector.
01:12
A3 is called to cj unit vector.
01:16
First part, the volume of the cell, a1 .a2, cross a3.
01:44
So it could be written as in determined method, root 3 by 2a, ay2, ay2, 0.
01:57
This is negative minus root 3 a y 2 a y 2 0 0 0 c on solving it it is to be half root 3 a square c this is the answer of part a now part b the primative translations of the reciprocal letters are b 1 is called to 2 pi, a2 cross a3 vector divided by modulus of a1 .a2 cross a3...