Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

None of these
an insulator
a piece of copper wire
a battery
a conductor

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and the passage of time on the horizontal axis
None of these
the passage of time on the vertical axis and amplitude on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis

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