Electronic Principles
A low-pass filter:

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

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Electronic Principles
What is a negative ion?

An atom that contains more electrons than neutrons
An atom that contains more electrons than protons
An atom that contains more protons than neutrons
None of these
An atom that contains more protons than electrons

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