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Online Physics Glossary
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Word Meaning Remarks
Nuclear fusion Reaction in which two nuclei are combined into one.
Nuclear reaction Reaction involving the strong force in which the number of protons or neutrons in a nucleus changes.
Nuclear reactor Device in which nuclear fusion is used to generate electricity.
Nuclear transmutation Change of one nucleus into another as the result of a nuclear reaction.
Nucleon Either a proton or a neutron.
Nuclide Nucleus of an isotope.
Object Source of diverging light rays; either luminous or illuminated.
Octave Interval between two frequencies with a ratio of two to one.
Ohm SI unit of resistance; one volt per ampere.
Ohmís law Resistance of object is constant, independent of voltage across it.
Opaque Material that does not transmit light.
Open- pipe resonator Cylindrical tube with both ends closed and a sound source at one end.
P-type semiconductor Semiconductor in which conduction is the result of motion of holes.
Pair production Formation of particle and antiparticle from gamma rays.
Parabolic mirror Mirror the shape of a paraboloid of revolution that has no spherical aberration.
 
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