Physics
Isotopes of an element contain

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

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Physics
RADAR is used for:

receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.
locating geostationary satellites.

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Physics
Holography is a technique of

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
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional black and white photograph

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