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Physics Definitions

Nuclear Reaction : A reaction in which there is a successful attempt by an external bombarding particle to change the content of a nucleus is known as a nuclear reaction.
Non-Uniform Magnetic Field : The magnetic field in a region is non-uniform if the magnitude or/and direction of magnetic flux density varies from point to point in the region.
Natural Points : A point near a magnet where the magnetic field due to the magnet is completely neutralized by the horizontal component of earth's magnetic field is called a natural point.
Nuclear Mass : The total mass of nucleons in the nucleons in the nucleus is called nuclear mass i.e. Nuclear Mass, A = Mass of protons + Mass of neutrons.
Nuclear Forces : The strong forces of attraction which firmly hold the nucleons in the nucleus are known as nuclear forces.
Nuclear Binding Energy : The total energy required to liberate all the nucleons from the nucleus (i.e. to disintegrate the nucleus completely into its constituent particles) is called nuclear binding energy of the nucleus.
Natural Radioactivity : The process of spontaneous (i.e. without external means, by itself) disintegration of the nuclei of heavy elements with the emission of certain type of radiation is known as natural radioactivity.
Nuclear Reactor : A nuclear reactor is a device in which controlled fission chain reaction take place. A nuclear reactor is also known as nuclear pile or atomic pile.
Nuclear Fusion : The process of combining two light nuclei to form a heavy nucleus with the release of huge amount of energy is known as nuclear fusion.
n-Type Semiconductor : When a small amount of pentavalent impurity is added to a pure semiconductor, it is known as n-type semiconductor.
Noise : The unwanted signal is called noise.