Physics
The wave like properties of electrons are useful in

Weather reports
All of these
Lasers
Magnifying objects

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

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Physics
A dynamo is a device which

Creates mechanical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates electrical energy

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