The diffraction pattern of crystalline solid gave a peak at $20=60^{\circ}$. What is the distance ( in cm ) between the layers which gave this peak?

( $\lambda$ of $X$-rays is $1.54 \mathring{A}$ ) $\left(\sin 30^{\circ}=0.5, \sin 60^{\circ}=0.866 ; n=1\right)$

An element crystallising in fcc lattice has a density of $$8.92 \mathrm{~g} \mathrm{~cm}^{-3}$$ and edge length of $$3.61 \times 10^{-8} \mathrm{~cm}$$. What is the atomic weight of element? $$\left(N=6.022 \times 10^{23} \mathrm{~mol}^{-1}\right)$$

Which of the following statement is correct for fcc lattice?

Match List I with List II.