Electronic Principles
A high-pass filter:

increases the level of all frequencies by a significant amount
passes lower-frequency signals and reduces higher-frequency signals
None of these
has no effect on ac signals
passes higher-frequency signals and reduces lower-frequency signals

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Electronic Principles
The period of a waveform is:

the time required to complete one full cycle
the number of cycles completed in one second
None of these
the time required for the voltage to rise from 10% to 90% of the peak amplitude
equal to 0.707 times the peak amplitude

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