Electronic Principles
What is a negative ion?

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

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Electronic Principles
A low-pass filter:

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

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