Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.

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Physics
Negative feedback in amplifiers

Decreases bandwidth and decreases noise
Increases bandwidth and decreases noise
Decreases bandwidth and increases noise
Increases bandwidth and increases noise

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