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Glossary Of Physics Terms
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Decibel:Unit of sound level, if P1 & P2 are two amounts of power, the first is said to be n decibels greater, where n = 10 log10 (P1/P2)
Density:The mass of a substance per unit volume.
Diffraction:The bending of light around the corners of an object.
Dioptre:Unit of power of a lens.
Direct current:An electrical current which always flows in one direction.
Dispersion:The splitting of white light into its component colors.
Displacement:The shortest distance between the initial and final position of a moving body. It is a vector quantity.
Distance:The actual path length covered by a body. It is a scalar quantity.
Doppler Effect:The apparent change in the frequency of a wave due to relative motion between the source and the observer.

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