Electronic Principles
The period of a waveform is:

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

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Electronic Principles
A low-pass filter:

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

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