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Online Physics Glossary
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Word Meaning Remarks
Instantaneous acceleration Acceleration at a specific time; slope of tangent to velocity- time graph.
Instantaneous position Position of an object at specific time.
Instantaneous velocity Slope of the tangent to position- time graph.
Insulator Material through which the flow of electrical charge carriers or heat is greatly reduced.
Interference fringes Pattern of dark and light bands from interference of light waves.
Interference of waves Displacements of two or more waves, producing either large or smaller waves.
Internal forces Forces between objects within a system.
Intrinsic semiconductor Semiconductor in which conduction is by charges due to host material, not impurities.
Inverse relationship Mathematical relationship between two variables, x and y, summarized by the equation xy=k, where k is a constant.
Ionizing radiation Particles or waves that can remove electrons from atoms, molecules, or atoms in a solid.
Isolated system A collection of objects not acted upon by external forces into which energy neither enters nor leaves.
Isotope Atomic nuclei having same number of protons but different numbers of neutrons.
 
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