A sample of crystalline solid scatters a beam of X-rays of wavelength 70.93pm at an angle $2\theta$ of $14.66^{\large\circ}$.If this is a second order reflection (n=2),calculate the distance between the parallel planes of atoms from which the scattered beam appears to have been reflected.

Question

$\begin{array}{1 1}555.94pm\\455.94pm\\255.94pm\\155.94pm\end{array}$