Online Physics Glossary 
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Word 
Meaning 
Remarks 
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.


Joule 
SI unit of energy equal to one Newtonmeter.


Joule heating 
Increase in temperature of electrical conductor due to conversion of electrical to thermal energy.


Kelvin temperature scale 
Scale with 0 K= absolute zero and 273.16 K = triple point of water.


Kepler’s laws 
Three laws of motion of bodies attracted together by the gravitational force.



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