PASCO WA-9316A Complete Microwave Optics System - Manual (Page 42)

Experiment Guide Teacher’s Guide
42
5.
Peaks occur at 18°, 24°, and 45°. These correspond to plane spacings of 4.6cm, 3.4cm, and 4.0 cm (n = 2 for the 45° peak) The
actual spacing is 3.8 cm The first peak is apparently a reflection off a different plane than the one we’re measuring.
6. 110 Plane:
The peak at 29° gives a plane spacing of 2.9 cm; the actual spacing is 2.7 cm
Answers to Questions
1. Other families of planes would be the 111 plane, the 101 plane, and so on. These would be difficult to observe with this
apparatus due to the small size of our “crystal”.
2. Not knowing the orientation of the interatomic planes of the crystal would increase the complexity of the analysis. We
could orient the crystal so that there was maximum transmission; this would indicate to us a 100 plane. From there, we
could try different angles until we had enough data to assemble a likely picture of the atomic spacing in the crystal.
• NOTE: Error of 10 to 15% is reasonable for this experiment.