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inertia
resistance of an object to change of its motion
interference
formation of points of cancellation and reinforcement where two coherent waves pass through each other
internal resistance
resistance inside a source of electrical energy; the loss of pd per unit current in the source when current passes through it
ion
a charged atom
ionisation
process of creating ions
isotopes if an element
atoms of an element with different numbers of neutrons and the same number of protons