Physics
Holography is a technique of

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

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Physics
Isotopes of an element contain

the same number of protons but different number of neutrons
equal number of nucleons
the same number of neutrons but different number of protons
equal number of protons and electrons

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