The first order reflection of a beam of X-rays of wavelength $1.54A^{\large\circ}$ from the (1 0 0) plane of a crystal of the simple cubic type occurs at an angle of $11.29^{\large\circ}$.Calculate the length of the unit cell.

Question

$\begin{array}{1 1}3.933\times 10^{-8}\\2.933\times 10^{-8}\\1.933\times 10^{-8}\\0.933\times 10^{-8}\end{array} $