When X-rays with ? = 193.7 pm are used, the second-order Bragg reflection from a set of parallel planes in a rubidium crystal occurs at an angle ? = 29.37°. Calculate the distance between the planes in the crystal.
a. 6.595 pm
b. 62.00 pm
c. 124.0 pm
d. 197.5 pm
e. 394.9 pm
Answer: E