Question

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1) diffraction of 0.154 nm X-rays from a graphite crystal? Shows the calculation steps.

Answer 1

In application of Braggs law

$2d.Sin\theta=n\lambda$

$Sin \theta=$ $n\lambda\over 2d$

$\theta=unknown$

$n=1$

$\lambda=154pm$

$d=335pm$

$\therefore$ $Sin \theta$ $=$ $1\times 154\over 2\times 335$ $=0.229$

$Sin \theta =0.229$

$\theta= 13.24°$