When Scattering $x$ -Rays with a Wavelength Of $3.28 \times 10-10 \mathrm{~m}$

Multiple Choice

When scattering $x$ -rays with a wavelength of $3.28 \times 10-10 \mathrm{~m}$ from a crystal, the first interference maximum occurs at an angle of 23.0 degrees relative to the crystal surface. What is the crystal spacing?

A) $16.8 \times 10^{-10} \mathrm{~m}$
B) $6.3 \times 10-10 \mathrm{~m}$
C) $8.4 \times 10^{-10} \mathrm{~m}$
D) $4.2 \times 10^{-10} \mathrm{~m}$