Physics
Negative feedback in amplifiers

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

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Physics
Holography is a technique of

Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent, sharp two diimensional black and white or multicolour photograph

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