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Online Physics Glossary
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Word Meaning Remarks
De Broglie wavelength Length of de Broglie wave of particle; Planckís constant divided by momentum of particle.
Decibel Unit of sound level.
Dependent variable Variable that responds to change in manipulated variable.
Derived units Unit of quantity that consists of combination of fundamental units.
Destructive interference Superposition of waves resulting in a combined wave with zero amplitude.
Diffraction Bending of waves around object in their path.
Diffraction grating Material containing many parallel lines very closely spaced that produces a light spectrum by interference.
Diffuse reflection Reflection of light into many directions by rough object.
Dimensional analysis Checking a derived equation by making sure dimensions are the same on both sides.
Diode Electrical device permitting only one way current flow.
Dispersion of light Variation with wavelength of speed of light through matter resulting in separation of light into spectrum.
Displacement Change in position. A vector quantity.
Dissonance Two or more sounds that, when together, sound unpleasant.
Distance Separation between two points. A scalar quantity.
Diverging lens Lens that causes light rays to spread apart or diverge; usually a concave lens.
 
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