Electronic Principles
A low-pass filter:

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

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Electronic Principles
What is a free electron?

An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
An electron that has been freed from its parent atom
An electron that costs nothing
None of these

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