Physics
Isotopes of an element contain

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

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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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