We discuss how a powder X-ray diffraction
(XRD) system can be used
to probe large pyrite (FeS2) crystals to reveal a peak
generally not documented in the literature. The ability to detect
this peak is attributed to the use of a large crystal, which gives
large signal intensities. This type of experiment provides a research-like
experience and gives students the opportunity to deepen their understanding
of diffraction orders. In this experiment students are first challenged
to be creative and determine how to mount a mineral crystal in a powder
XRD system and then practice critical thinking in order to determine
the origin of the unknown XRD peak. This experiment may also be generalized
to crystals other than pyrite.
We propose an inquiry-based electronics experiment in which students can practice being creative. Through this activity students can learn under what conditions the use of a voltmeter will have measurable effects on the electric circuit and how to design the circuit to measure the internal resistance of the voltmeter.
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