Two Planes of Atoms in a Crystal Are Separated By 3.25

Multiple Choice

Two planes of atoms in a crystal are separated by $3.25 \times 10-10 \mathrm{~m}$ . Light of what wavelength would show constructive interference at an angle of 17.5 degrees relative to the crystal surface?

A) $1.95 \times 10-10 \mathrm{~m}$
B) $9.75 \times 10^{-10} \mathrm{~m}$
C) $1.46 \times 10^{-10} \mathrm{~m}$
D) $3.9 \times 10-10 \mathrm{~m}$
E) $4.9 \times 10^{-9} \mathrm{~m}$