Solids and Modern Materials: Structure, Properties, and Applications

Which of the following statements best explains why graphene is considered a revolutionary material for electronics and engineering applications?

X-ray crystallography is a powerful tool for determining the structure of crystalline solids. Which equation is used to relate the wavelength of X-rays, the spacing between atomic planes, and the diffraction angle?

A first-order X-ray diffraction maximum is observed at $32.6^\circ$ for an iron crystal using X-rays of wavelength $154$ pm. What is the distance between the layers of iron atoms? (Use Bragg’s Law: $n\lambda = 2d\sin\theta$)